42637951 has 4 divisors (see below), whose sum is σ = 43015392. Its totient is φ = 42260512.

The previous prime is 42637937. The next prime is 42637997. The reversal of 42637951 is 15973624.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42637951 - 2¹³ = 42629759 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42637951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42637351) 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, 188551 + ... + 188776.

It is an arithmetic number, because the mean of its divisors is an integer number (10753848).

Almost surely, 2^42637951 is an apocalyptic number.

42637951 is a deficient number, since it is larger than the sum of its proper divisors (377441).

42637951 is a wasteful number, since it uses less digits than its factorization.

42637951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377440.

The product of its digits is 45360, while the sum is 37.

The square root of 42637951 is about 6529.7741921141. The cubic root of 42637951 is about 349.3537762844.

The spelling of 42637951 in words is "forty-two million, six hundred thirty-seven thousand, nine hundred fifty-one".