15397639 has 2 divisors, whose sum is σ = 15397640. Its totient is φ = 15397638.

The previous prime is 15397601. The next prime is 15397651. The reversal of 15397639 is 93679351.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15397639 - 2¹⁷ = 15266567 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15397595 and 15397604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15397939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7698819 + 7698820.

It is an arithmetic number, because the mean of its divisors is an integer number (7698820).

Almost surely, 2^15397639 is an apocalyptic number.

15397639 is a deficient number, since it is larger than the sum of its proper divisors (1).

15397639 is an equidigital number, since it uses as much as digits as its factorization.

15397639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 153090, while the sum is 43.

The square root of 15397639 is about 3923.9825432843. The cubic root of 15397639 is about 248.7814784705.

The spelling of 15397639 in words is "fifteen million, three hundred ninety-seven thousand, six hundred thirty-nine".