155155399 has 16 divisors (see below), whose sum is σ = 179262720. Its totient is φ = 131544000.

The previous prime is 155155313. The next prime is 155155409. The reversal of 155155399 is 993551551.

It is not a de Polignac number, because 155155399 - 2⁷ = 155155271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155155199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409192 + ... + 409570.

It is an arithmetic number, because the mean of its divisors is an integer number (11203920).

Almost surely, 2^155155399 is an apocalyptic number.

155155399 is a deficient number, since it is larger than the sum of its proper divisors (24107321).

155155399 is a wasteful number, since it uses less digits than its factorization.

155155399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870.

The product of its digits is 151875, while the sum is 43.

The square root of 155155399 is about 12456.1390085371. The cubic root of 155155399 is about 537.3479926386.

The spelling of 155155399 in words is "one hundred fifty-five million, one hundred fifty-five thousand, three hundred ninety-nine".