11956638 has 16 divisors (see below), whose sum is σ = 24685056. Its totient is φ = 3856920.

The previous prime is 11956631. The next prime is 11956657. The reversal of 11956638 is 83665911.

It is a super-2 number, since 2×11956638² = 285922384526088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11956596 and 11956605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11956631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31956 + ... + 32327.

It is an arithmetic number, because the mean of its divisors is an integer number (1542816).

Almost surely, 2^11956638 is an apocalyptic number.

11956638 is an abundant number, since it is smaller than the sum of its proper divisors (12728418).

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

11956638 is a wasteful number, since it uses less digits than its factorization.

11956638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64319.

The product of its digits is 38880, while the sum is 39.

The square root of 11956638 is about 3457.8371852937. The cubic root of 11956638 is about 228.6667540263. Note that the first 3 decimals are identical.

The spelling of 11956638 in words is "eleven million, nine hundred fifty-six thousand, six hundred thirty-eight".