42391228 has 24 divisors (see below), whose sum is σ = 81411120. Its totient is φ = 19153920.

The previous prime is 42391169. The next prime is 42391241. The reversal of 42391228 is 82219324.

It is a super-2 number, since 2×42391228² = 3594032422695968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42391228.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4828 + ... + 10396.

It is an arithmetic number, because the mean of its divisors is an integer number (3392130).

Almost surely, 2^42391228 is an apocalyptic number.

It is an amenable number.

42391228 is a deficient number, since it is larger than the sum of its proper divisors (39019892).

42391228 is a wasteful number, since it uses less digits than its factorization.

42391228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5757 (or 5755 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 42391228 is about 6510.8546290022. The cubic root of 42391228 is about 348.6786312681.

The spelling of 42391228 in words is "forty-two million, three hundred ninety-one thousand, two hundred twenty-eight".