11428639 has 8 divisors (see below), whose sum is σ = 11860560. Its totient is φ = 10999296.

The previous prime is 11428621. The next prime is 11428649. The reversal of 11428639 is 93682411.

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 11428639 - 2⁷ = 11428511 is a prime.

It is a super-2 number, since 2×11428639² = 261227578784642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11428609) 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, 16392 + ... + 17074.

It is an arithmetic number, because the mean of its divisors is an integer number (1482570).

Almost surely, 2^11428639 is an apocalyptic number.

11428639 is a deficient number, since it is larger than the sum of its proper divisors (431921).

11428639 is an equidigital number, since it uses as much as digits as its factorization.

11428639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289.

The product of its digits is 10368, while the sum is 34.

The square root of 11428639 is about 3380.6270128484. The cubic root of 11428639 is about 225.2500200172.

The spelling of 11428639 in words is "eleven million, four hundred twenty-eight thousand, six hundred thirty-nine".