64139423 has 2 divisors, whose sum is σ = 64139424. Its totient is φ = 64139422.

The previous prime is 64139417. The next prime is 64139429. The reversal of 64139423 is 32493146.

It is a balanced prime because it is at equal distance from previous prime (64139417) and next prime (64139429).

It is a cyclic number.

It is not a de Polignac number, because 64139423 - 2¹⁶ = 64073887 is a prime.

It is a super-2 number, since 2×64139423² = 8227731165545858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64139423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64139429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32069711 + 32069712.

It is an arithmetic number, because the mean of its divisors is an integer number (32069712).

Almost surely, 2^64139423 is an apocalyptic number.

64139423 is a deficient number, since it is larger than the sum of its proper divisors (1).

64139423 is an equidigital number, since it uses as much as digits as its factorization.

64139423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 32.

The square root of 64139423 is about 8008.7091968681. The cubic root of 64139423 is about 400.2902539141.

The spelling of 64139423 in words is "sixty-four million, one hundred thirty-nine thousand, four hundred twenty-three".