155355840 has 112 divisors (see below), whose sum is σ = 548091360. Its totient is φ = 41425920.

The previous prime is 155355833. The next prime is 155355857. The reversal of 155355840 is 48553551.

It is a happy number.

155355840 is a `hidden beast` number, since 15 + 53 + 558 + 40 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 155355795 and 155355804.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351 + ... + 17630.

Almost surely, 2^155355840 is an apocalyptic number.

155355840 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 155355840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274045680).

155355840 is an abundant number, since it is smaller than the sum of its proper divisors (392735520).

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

155355840 is a wasteful number, since it uses less digits than its factorization.

155355840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18007 (or 17991 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

The square root of 155355840 is about 12464.1822836478. The cubic root of 155355840 is about 537.5792881051.

The spelling of 155355840 in words is "one hundred fifty-five million, three hundred fifty-five thousand, eight hundred forty".