53978409 has 27 divisors (see below), whose sum is σ = 81597789. Its totient is φ = 34383960.

The previous prime is 53978399. The next prime is 53978413. The reversal of 53978409 is 90487935.

The square root of 53978409 is 7347.

It is a perfect power (a square), and thus also a powerful number.

53978409 is a `hidden beast` number, since 539 + 78 + 40 + 9 = 666.

It is not a de Polignac number, because 53978409 - 2⁵ = 53978377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53978479) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 683232 + ... + 683310.

Almost surely, 2^53978409 is an apocalyptic number.

53978409 is the 7347-th square number.

53978409 is the 3674-th centered octagonal number.

It is an amenable number.

53978409 is a deficient number, since it is larger than the sum of its proper divisors (27619380).

53978409 is an equidigital number, since it uses as much as digits as its factorization.

53978409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The cubic root of 53978409 is about 377.9259324097.

The spelling of 53978409 in words is "fifty-three million, nine hundred seventy-eight thousand, four hundred nine".