42637813 has 4 divisors (see below), whose sum is σ = 42651808. Its totient is φ = 42623820.

The previous prime is 42637807. The next prime is 42637817. The reversal of 42637813 is 31873624.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42637813 - 2⁵ = 42637781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42637817) 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, 273 + ... + 9238.

It is an arithmetic number, because the mean of its divisors is an integer number (10662952).

Almost surely, 2^42637813 is an apocalyptic number.

It is an amenable number.

42637813 is a deficient number, since it is larger than the sum of its proper divisors (13995).

42637813 is an equidigital number, since it uses as much as digits as its factorization.

42637813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13994.

The product of its digits is 24192, while the sum is 34.

The square root of 42637813 is about 6529.7636251246. The cubic root of 42637813 is about 349.3533993833.

The spelling of 42637813 in words is "forty-two million, six hundred thirty-seven thousand, eight hundred thirteen".