155400720 has 40 divisors (see below), whose sum is σ = 481742976. Its totient is φ = 41440128.

The previous prime is 155400709. The next prime is 155400731. The reversal of 155400720 is 27004551.

It is an interprime number because it is at equal distance from previous prime (155400709) and next prime (155400731).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323512 + ... + 323991.

Almost surely, 2^155400720 is an apocalyptic number.

155400720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155400720 is an abundant number, since it is smaller than the sum of its proper divisors (326342256).

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

155400720 is a wasteful number, since it uses less digits than its factorization.

155400720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647519 (or 647513 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 155400720 is about 12465.9825124216. The cubic root of 155400720 is about 537.6310493511.

The spelling of 155400720 in words is "one hundred fifty-five million, four hundred thousand, seven hundred twenty".