10639939 has 4 divisors (see below), whose sum is σ = 10699560. Its totient is φ = 10580320.

The previous prime is 10639931. The next prime is 10639949. The reversal of 10639939 is 93993601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93993601 = 13 ⋅7230277.

It is a cyclic number.

It is not a de Polignac number, because 10639939 - 2³ = 10639931 is a prime.

It is a super-2 number, since 2×10639939² = 226416603847442, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10639931) 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, 29542 + ... + 29899.

It is an arithmetic number, because the mean of its divisors is an integer number (2674890).

Almost surely, 2^10639939 is an apocalyptic number.

10639939 is a deficient number, since it is larger than the sum of its proper divisors (59621).

10639939 is an equidigital number, since it uses as much as digits as its factorization.

10639939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59620.

The product of its (nonzero) digits is 39366, while the sum is 40.

The square root of 10639939 is about 3261.8919356717. The cubic root of 10639939 is about 219.9444694557.

The spelling of 10639939 in words is "ten million, six hundred thirty-nine thousand, nine hundred thirty-nine".