155999730 has 32 divisors (see below), whose sum is σ = 375404544. Its totient is φ = 41488256.

The previous prime is 155999707. The next prime is 155999797. The reversal of 155999730 is 37999551.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 155999730.

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, 4702 + ... + 18278.

It is an arithmetic number, because the mean of its divisors is an integer number (11731392).

Almost surely, 2^155999730 is an apocalyptic number.

155999730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155999730 is an abundant number, since it is smaller than the sum of its proper divisors (219404814).

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

155999730 is a wasteful number, since it uses less digits than its factorization.

155999730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13970.

The product of its (nonzero) digits is 382725, while the sum is 48.

The square root of 155999730 is about 12489.9851881417. The cubic root of 155999730 is about 538.3209506386.

The spelling of 155999730 in words is "one hundred fifty-five million, nine hundred ninety-nine thousand, seven hundred thirty".