155403840 has 56 divisors (see below), whose sum is σ = 493410240. Its totient is φ = 41440768.

The previous prime is 155403803. The next prime is 155403841. The reversal of 155403840 is 48304551.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 155403798 and 155403807.

It is not an unprimeable number, because it can be changed into a prime (155403841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79980 + ... + 81899.

Almost surely, 2^155403840 is an apocalyptic number.

155403840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155403840 is an abundant number, since it is smaller than the sum of its proper divisors (338006400).

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

155403840 is a wasteful number, since it uses less digits than its factorization.

155403840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161899 (or 161889 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 155403840 is about 12466.1076523508. The cubic root of 155403840 is about 537.6346473560.

The spelling of 155403840 in words is "one hundred fifty-five million, four hundred three thousand, eight hundred forty".