10639940 has 12 divisors (see below), whose sum is σ = 22343916. Its totient is φ = 4255968.

The previous prime is 10639931. The next prime is 10639949. The reversal of 10639940 is 4993601.

It is an interprime number because it is at equal distance from previous prime (10639931) and next prime (10639949).

It can be written as a sum of positive squares in 2 ways, for example, as 6543364 + 4096576 = 2558^2 + 2024^2 .

It is a super-2 number, since 2×10639940² = 226416646407200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10639897 and 10639906.

It is not an unprimeable number, because it can be changed into a prime (10639949) 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, 265979 + ... + 266018.

It is an arithmetic number, because the mean of its divisors is an integer number (1861993).

Almost surely, 2^10639940 is an apocalyptic number.

10639940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10639940 is an abundant number, since it is smaller than the sum of its proper divisors (11703976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10639940 is a wasteful number, since it uses less digits than its factorization.

10639940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532006 (or 532004 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 10639940 is about 3261.8920889570. The cubic root of 10639940 is about 219.9444763462.

The spelling of 10639940 in words is "ten million, six hundred thirty-nine thousand, nine hundred forty".