155399995 has 4 divisors (see below), whose sum is σ = 186480000. Its totient is φ = 124319992.

The previous prime is 155399957. The next prime is 155400017. The reversal of 155399995 is 599993551.

It is a happy number.

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 155399995 - 2⁹ = 155399483 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15539995 + ... + 15540004.

It is an arithmetic number, because the mean of its divisors is an integer number (46620000).

Almost surely, 2^155399995 is an apocalyptic number.

155399995 is a deficient number, since it is larger than the sum of its proper divisors (31080005).

155399995 is an equidigital number, since it uses as much as digits as its factorization.

155399995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31080004.

The product of its digits is 2460375, while the sum is 55.

The square root of 155399995 is about 12465.9534332517. The cubic root of 155399995 is about 537.6302132694.

The spelling of 155399995 in words is "one hundred fifty-five million, three hundred ninety-nine thousand, nine hundred ninety-five".