42391072 has 12 divisors (see below), whose sum is σ = 83457486. Its totient is φ = 21195520.

The previous prime is 42391057. The next prime is 42391073. The reversal of 42391072 is 27019324.

It can be written as a sum of positive squares in only one way, i.e., 27920656 + 14470416 = 5284^2 + 3804^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 42391072.

It is not an unprimeable number, because it can be changed into a prime (42391073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662329 + ... + 662392.

Almost surely, 2^42391072 is an apocalyptic number.

It is an amenable number.

42391072 is a deficient number, since it is larger than the sum of its proper divisors (41066414).

42391072 is a wasteful number, since it uses less digits than its factorization.

42391072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324731 (or 1324723 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 42391072 is about 6510.8426489971. The cubic root of 42391072 is about 348.6782035544.

The spelling of 42391072 in words is "forty-two million, three hundred ninety-one thousand, seventy-two".