15420623 has 2 divisors, whose sum is σ = 15420624. Its totient is φ = 15420622.

The previous prime is 15420619. The next prime is 15420637. The reversal of 15420623 is 32602451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15420623 - 2² = 15420619 is a prime.

It is a super-2 number, since 2×15420623² = 475591227416258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15420523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7710311 + 7710312.

It is an arithmetic number, because the mean of its divisors is an integer number (7710312).

Almost surely, 2^15420623 is an apocalyptic number.

15420623 is a deficient number, since it is larger than the sum of its proper divisors (1).

15420623 is an equidigital number, since it uses as much as digits as its factorization.

15420623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 15420623 is about 3926.9101084695. The cubic root of 15420623 is about 248.9052020011.

The spelling of 15420623 in words is "fifteen million, four hundred twenty thousand, six hundred twenty-three".