155791389 has 16 divisors (see below), whose sum is σ = 225921024. Its totient is φ = 94920000.

The previous prime is 155791387. The next prime is 155791453. The reversal of 155791389 is 983197551.

It is not a de Polignac number, because 155791389 - 2¹ = 155791387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155791387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15837 + ... + 23714.

It is an arithmetic number, because the mean of its divisors is an integer number (14120064).

Almost surely, 2^155791389 is an apocalyptic number.

It is an amenable number.

155791389 is a deficient number, since it is larger than the sum of its proper divisors (70129635).

155791389 is a wasteful number, since it uses less digits than its factorization.

155791389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39668.

The product of its digits is 340200, while the sum is 48.

The square root of 155791389 is about 12481.6420794702. The cubic root of 155791389 is about 538.0811974663.

The spelling of 155791389 in words is "one hundred fifty-five million, seven hundred ninety-one thousand, three hundred eighty-nine".