53978407 has 4 divisors (see below), whose sum is σ = 61689616. Its totient is φ = 46267200.

The previous prime is 53978399. The next prime is 53978413. The reversal of 53978407 is 70487935.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 53978407 - 2³ = 53978399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53978437) 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, 3855594 + ... + 3855607.

It is an arithmetic number, because the mean of its divisors is an integer number (15422404).

Almost surely, 2^53978407 is an apocalyptic number.

53978407 is a deficient number, since it is larger than the sum of its proper divisors (7711209).

53978407 is an equidigital number, since it uses as much as digits as its factorization.

53978407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7711208.

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 53978407 is about 7346.9998638900. Note that the first 3 decimals coincide. The cubic root of 53978407 is about 377.9259277421.

The spelling of 53978407 in words is "fifty-three million, nine hundred seventy-eight thousand, four hundred seven".