43700639 has 2 divisors, whose sum is σ = 43700640. Its totient is φ = 43700638.

The previous prime is 43700617. The next prime is 43700653. The reversal of 43700639 is 93600734.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43700639 - 2¹⁶ = 43635103 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43700039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21850319 + 21850320.

It is an arithmetic number, because the mean of its divisors is an integer number (21850320).

Almost surely, 2^43700639 is an apocalyptic number.

43700639 is a deficient number, since it is larger than the sum of its proper divisors (1).

43700639 is an equidigital number, since it uses as much as digits as its factorization.

43700639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 32.

The square root of 43700639 is about 6610.6458837242. The cubic root of 43700639 is about 352.2323679861.

The spelling of 43700639 in words is "forty-three million, seven hundred thousand, six hundred thirty-nine".