42831621 has 12 divisors (see below), whose sum is σ = 70706272. Its totient is φ = 24475176.

The previous prime is 42831587. The next prime is 42831631. The reversal of 42831621 is 12613824.

42831621 is a `hidden beast` number, since 4 + 2 + 8 + 31 + 621 = 666.

It is not a de Polignac number, because 42831621 - 2⁶ = 42831557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42831631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 339871 + ... + 339996.

Almost surely, 2^42831621 is an apocalyptic number.

It is an amenable number.

42831621 is a deficient number, since it is larger than the sum of its proper divisors (27874651).

42831621 is a wasteful number, since it uses less digits than its factorization.

42831621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679880 (or 679877 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 42831621 is about 6544.5871527546. The cubic root of 42831621 is about 349.8819220738.

The spelling of 42831621 in words is "forty-two million, eight hundred thirty-one thousand, six hundred twenty-one".