155440992 has 192 divisors, whose sum is σ = 496419840. Its totient is φ = 41631744.

The previous prime is 155440981. The next prime is 155441003. The reversal of 155440992 is 299044551.

It is an interprime number because it is at equal distance from previous prime (155440981) and next prime (155441003).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 155440992.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1375528 + ... + 1375640.

It is an arithmetic number, because the mean of its divisors is an integer number (2585520).

Almost surely, 2^155440992 is an apocalyptic number.

155440992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155440992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248209920).

155440992 is an abundant number, since it is smaller than the sum of its proper divisors (340978848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155440992 is a wasteful number, since it uses less digits than its factorization.

155440992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 155440992 is about 12467.5976835957. The cubic root of 155440992 is about 537.6774875906.

The spelling of 155440992 in words is "one hundred fifty-five million, four hundred forty thousand, nine hundred ninety-two".