53921407 has 4 divisors (see below), whose sum is σ = 56265840. Its totient is φ = 51576976.

The previous prime is 53921393. The next prime is 53921471. The reversal of 53921407 is 70412935.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53921407 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53931407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1172182 + ... + 1172227.

It is an arithmetic number, because the mean of its divisors is an integer number (14066460).

Almost surely, 2^53921407 is an apocalyptic number.

53921407 is a deficient number, since it is larger than the sum of its proper divisors (2344433).

53921407 is a wasteful number, since it uses less digits than its factorization.

53921407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344432.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 53921407 is about 7343.1197048666. The cubic root of 53921407 is about 377.7928537589.

The spelling of 53921407 in words is "fifty-three million, nine hundred twenty-one thousand, four hundred seven".