13593978 has 24 divisors (see below), whose sum is σ = 29521908. Its totient is φ = 4520832.

The previous prime is 13593973. The next prime is 13593997. The reversal of 13593978 is 87939531.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13593969 + 9 = 3687^2 + 3^2 .

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13593971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13426 + ... + 14402.

Almost surely, 2^13593978 is an apocalyptic number.

13593978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13593978 is an abundant number, since it is smaller than the sum of its proper divisors (15927930).

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

13593978 is a wasteful number, since it uses less digits than its factorization.

13593978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758 (or 1755 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 13593978 is about 3687.0012205043. The cubic root of 13593978 is about 238.6614020283.

The spelling of 13593978 in words is "thirteen million, five hundred ninety-three thousand, nine hundred seventy-eight".