42091972 has 12 divisors (see below), whose sum is σ = 79327276. Its totient is φ = 19427040.

The previous prime is 42091967. The next prime is 42091993. The reversal of 42091972 is 27919024.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2452356 + 39639616 = 1566^2 + 6296^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404679 + ... + 404782.

Almost surely, 2^42091972 is an apocalyptic number.

It is an amenable number.

42091972 is a deficient number, since it is larger than the sum of its proper divisors (37235304).

42091972 is a wasteful number, since it uses less digits than its factorization.

42091972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809478 (or 809476 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 42091972 is about 6487.8326118974. The cubic root of 42091972 is about 347.8562073835.

The spelling of 42091972 in words is "forty-two million, ninety-one thousand, nine hundred seventy-two".