155409540 has 192 divisors, whose sum is σ = 521579520. Its totient is φ = 34076160.

The previous prime is 155409539. The next prime is 155409571. The reversal of 155409540 is 45904551.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 506067 + ... + 506373.

It is an arithmetic number, because the mean of its divisors is an integer number (2716560).

Almost surely, 2^155409540 is an apocalyptic number.

155409540 is a gapful number since it is divisible by the number (10) 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 155409540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260789760).

155409540 is an abundant number, since it is smaller than the sum of its proper divisors (366169980).

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

155409540 is a wasteful number, since it uses less digits than its factorization.

155409540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 155409540 is about 12466.3362701317. The cubic root of 155409540 is about 537.6412205098.

The spelling of 155409540 in words is "one hundred fifty-five million, four hundred nine thousand, five hundred forty".