155405646 has 96 divisors (see below), whose sum is σ = 382112640. Its totient is φ = 45240000.

The previous prime is 155405639. The next prime is 155405651. The reversal of 155405646 is 646504551.

155405646 is a `hidden beast` number, since 1 + 5 + 5 + 4 + 0 + 5 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 155405646.

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 47 ways as a sum of consecutive naturals, for example, 619021 + ... + 619271.

It is an arithmetic number, because the mean of its divisors is an integer number (3980340).

Almost surely, 2^155405646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155405646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191056320).

155405646 is an abundant number, since it is smaller than the sum of its proper divisors (226706994).

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

155405646 is a wasteful number, since it uses less digits than its factorization.

155405646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 155405646 is about 12466.1800885436. The cubic root of 155405646 is about 537.6367300253.

The spelling of 155405646 in words is "one hundred fifty-five million, four hundred five thousand, six hundred forty-six".