65421379 has 4 divisors (see below), whose sum is σ = 65592576. Its totient is φ = 65250184.

The previous prime is 65421373. The next prime is 65421397. The reversal of 65421379 is 97312456.

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

It is a cyclic number.

It is not a de Polignac number, because 65421379 - 2⁹ = 65420867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65421373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85024 + ... + 85789.

It is an arithmetic number, because the mean of its divisors is an integer number (16398144).

Almost surely, 2^65421379 is an apocalyptic number.

65421379 is a deficient number, since it is larger than the sum of its proper divisors (171197).

65421379 is a wasteful number, since it uses less digits than its factorization.

65421379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171196.

The product of its digits is 45360, while the sum is 37.

The square root of 65421379 is about 8088.3483480869. The cubic root of 65421379 is about 402.9395509330.

It can be divided in two parts, 6542 and 1379, that added together give a square (7921 = 89²).

The spelling of 65421379 in words is "sixty-five million, four hundred twenty-one thousand, three hundred seventy-nine".