53921397 has 4 divisors (see below), whose sum is σ = 71895200. Its totient is φ = 35947596.

The previous prime is 53921393. The next prime is 53921471. The reversal of 53921397 is 79312935.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 53921397 - 2² = 53921393 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 (53921393) 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, 8986897 + ... + 8986902.

It is an arithmetic number, because the mean of its divisors is an integer number (17973800).

Almost surely, 2^53921397 is an apocalyptic number.

It is an amenable number.

53921397 is a deficient number, since it is larger than the sum of its proper divisors (17973803).

53921397 is a wasteful number, since it uses less digits than its factorization.

53921397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17973802.

The product of its digits is 51030, while the sum is 39.

The square root of 53921397 is about 7343.1190239571. The cubic root of 53921397 is about 377.7928304043.

The spelling of 53921397 in words is "fifty-three million, nine hundred twenty-one thousand, three hundred ninety-seven".