155988638 has 8 divisors (see below), whose sum is σ = 251981688. Its totient is φ = 71994744.

The previous prime is 155988631. The next prime is 155988647. The reversal of 155988638 is 836889551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 155988638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155988631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2999756 + ... + 2999807.

It is an arithmetic number, because the mean of its divisors is an integer number (31497711).

Almost surely, 2^155988638 is an apocalyptic number.

155988638 is a deficient number, since it is larger than the sum of its proper divisors (95993050).

155988638 is a wasteful number, since it uses less digits than its factorization.

155988638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5999578.

The product of its digits is 2073600, while the sum is 53.

The square root of 155988638 is about 12489.5411444937. The cubic root of 155988638 is about 538.3081916475.

The spelling of 155988638 in words is "one hundred fifty-five million, nine hundred eighty-eight thousand, six hundred thirty-eight".