15439423 has 2 divisors, whose sum is σ = 15439424. Its totient is φ = 15439422.

The previous prime is 15439399. The next prime is 15439429. The reversal of 15439423 is 32493451.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15439423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15439429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7719711 + 7719712.

It is an arithmetic number, because the mean of its divisors is an integer number (7719712).

Almost surely, 2^15439423 is an apocalyptic number.

15439423 is a deficient number, since it is larger than the sum of its proper divisors (1).

15439423 is an equidigital number, since it uses as much as digits as its factorization.

15439423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 15439423 is about 3929.3031188749. The cubic root of 15439423 is about 249.0063115662.

The spelling of 15439423 in words is "fifteen million, four hundred thirty-nine thousand, four hundred twenty-three".