155398172 has 6 divisors (see below), whose sum is σ = 271946808. Its totient is φ = 77699084.

The previous prime is 155398163. The next prime is 155398193. The reversal of 155398172 is 271893551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19424768 + ... + 19424775.

It is an arithmetic number, because the mean of its divisors is an integer number (45324468).

Almost surely, 2^155398172 is an apocalyptic number.

It is an amenable number.

155398172 is a deficient number, since it is larger than the sum of its proper divisors (116548636).

155398172 is a wasteful number, since it uses less digits than its factorization.

155398172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38849547 (or 38849545 counting only the distinct ones).

The product of its digits is 75600, while the sum is 41.

The square root of 155398172 is about 12465.8803138808. The cubic root of 155398172 is about 537.6281109447.

The spelling of 155398172 in words is "one hundred fifty-five million, three hundred ninety-eight thousand, one hundred seventy-two".