155920907 has 4 divisors (see below), whose sum is σ = 161297520. Its totient is φ = 150544296.

The previous prime is 155920883. The next prime is 155920927. The reversal of 155920907 is 709029551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155920907 - 2¹⁴ = 155904523 is a prime.

It is a super-2 number, since 2×155920907² = 48622658479405298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155920927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2688263 + ... + 2688320.

It is an arithmetic number, because the mean of its divisors is an integer number (40324380).

Almost surely, 2^155920907 is an apocalyptic number.

155920907 is a deficient number, since it is larger than the sum of its proper divisors (5376613).

155920907 is an equidigital number, since it uses as much as digits as its factorization.

155920907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5376612.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 155920907 is about 12486.8293413500. The cubic root of 155920907 is about 538.2302683856.

The spelling of 155920907 in words is "one hundred fifty-five million, nine hundred twenty thousand, nine hundred seven".