11639947 has 8 divisors (see below), whose sum is σ = 12825072. Its totient is φ = 10476000.

The previous prime is 11639897. The next prime is 11639963. The reversal of 11639947 is 74993611.

11639947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11639947 - 2⁷ = 11639819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11639987) 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, 4128 + ... + 6349.

It is an arithmetic number, because the mean of its divisors is an integer number (1603134).

Almost surely, 2^11639947 is an apocalyptic number.

11639947 is a deficient number, since it is larger than the sum of its proper divisors (1185125).

11639947 is a wasteful number, since it uses less digits than its factorization.

11639947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10589.

The product of its digits is 40824, while the sum is 40.

The square root of 11639947 is about 3411.7366545500. The cubic root of 11639947 is about 226.6297923964.

The spelling of 11639947 in words is "eleven million, six hundred thirty-nine thousand, nine hundred forty-seven".