42639497 has 4 divisors (see below), whose sum is σ = 42662016. Its totient is φ = 42616980.

The previous prime is 42639463. The next prime is 42639511. The reversal of 42639497 is 79493624.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42639497 - 2¹⁶ = 42573961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42639397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8129 + ... + 12302.

It is an arithmetic number, because the mean of its divisors is an integer number (10665504).

Almost surely, 2^42639497 is an apocalyptic number.

It is an amenable number.

42639497 is a deficient number, since it is larger than the sum of its proper divisors (22519).

42639497 is a wasteful number, since it uses less digits than its factorization.

42639497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22518.

The product of its digits is 326592, while the sum is 44.

The square root of 42639497 is about 6529.8925718575. The cubic root of 42639497 is about 349.3579986137.

The spelling of 42639497 in words is "forty-two million, six hundred thirty-nine thousand, four hundred ninety-seven".