13633978 has 8 divisors (see below), whose sum is σ = 20710080. Its totient is φ = 6730620.

The previous prime is 13633943. The next prime is 13633979. The reversal of 13633978 is 87933631.

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

It is a super-2 number, since 2×13633978² = 371770712208968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13633978.

It is not an unprimeable number, because it can be changed into a prime (13633979) 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, 42988 + ... + 43303.

It is an arithmetic number, because the mean of its divisors is an integer number (2588760).

Almost surely, 2^13633978 is an apocalyptic number.

13633978 is a deficient number, since it is larger than the sum of its proper divisors (7076102).

13633978 is an equidigital number, since it uses as much as digits as its factorization.

13633978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86372.

The product of its digits is 81648, while the sum is 40.

The square root of 13633978 is about 3692.4216985604. The cubic root of 13633978 is about 238.8952582241.

The spelling of 13633978 in words is "thirteen million, six hundred thirty-three thousand, nine hundred seventy-eight".