42155388 has 36 divisors (see below), whose sum is σ = 116247768. Its totient is φ = 12774240.

The previous prime is 42155371. The next prime is 42155401. The reversal of 42155388 is 88355124.

It is a happy number.

42155388 is a `hidden beast` number, since 4 + 21 + 553 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52831 + ... + 53622.

Almost surely, 2^42155388 is an apocalyptic number.

It is an amenable number.

42155388 is an abundant number, since it is smaller than the sum of its proper divisors (74092380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42155388 is a wasteful number, since it uses less digits than its factorization.

42155388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106474 (or 106469 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 42155388 is about 6492.7180748897. The cubic root of 42155388 is about 348.0308137598.

The spelling of 42155388 in words is "forty-two million, one hundred fifty-five thousand, three hundred eighty-eight".