11639943 has 28 divisors (see below), whose sum is σ = 19953808. Its totient is φ = 6648480.

The previous prime is 11639897. The next prime is 11639963. The reversal of 11639943 is 34993611.

11639943 is a `hidden beast` number, since 11 + 639 + 9 + 4 + 3 = 666.

11639943 is digitally balanced in base 2, base 4 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11639943 - 2²² = 7445639 is a prime.

11639943 is strictly pandigital in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 11639898 and 11639907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11639963) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 3963 + ... + 6243.

It is an arithmetic number, because the mean of its divisors is an integer number (712636).

Almost surely, 2^11639943 is an apocalyptic number.

11639943 is a deficient number, since it is larger than the sum of its proper divisors (8313865).

11639943 is an frugal number, since it uses more digits than its factorization.

11639943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306 (or 2291 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 11639943 is about 3411.7360683382. The cubic root of 11639943 is about 226.6297664364.

The spelling of 11639943 in words is "eleven million, six hundred thirty-nine thousand, nine hundred forty-three".