84640237 has 4 divisors (see below), whose sum is σ = 92334816. Its totient is φ = 76945660.

The previous prime is 84640223. The next prime is 84640247. The reversal of 84640237 is 73204648.

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 not a de Polignac number, because 84640237 - 2¹⁵ = 84607469 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 (84640217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3847273 + ... + 3847294.

It is an arithmetic number, because the mean of its divisors is an integer number (23083704).

Almost surely, 2^84640237 is an apocalyptic number.

It is an amenable number.

84640237 is a deficient number, since it is larger than the sum of its proper divisors (7694579).

84640237 is a wasteful number, since it uses less digits than its factorization.

84640237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7694578.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 84640237 is about 9200.0128804258. The cubic root of 84640237 is about 439.0617697341.

The spelling of 84640237 in words is "eighty-four million, six hundred forty thousand, two hundred thirty-seven".