15397973 has 2 divisors, whose sum is σ = 15397974. Its totient is φ = 15397972.

The previous prime is 15397951. The next prime is 15397981. The reversal of 15397973 is 37979351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12096484 + 3301489 = 3478^2 + 1817^2 .

It is an emirp because it is prime and its reverse (37979351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15397973 - 2⁶ = 15397909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15397073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7698986 + 7698987.

It is an arithmetic number, because the mean of its divisors is an integer number (7698987).

Almost surely, 2^15397973 is an apocalyptic number.

It is an amenable number.

15397973 is a deficient number, since it is larger than the sum of its proper divisors (1).

15397973 is an equidigital number, since it uses as much as digits as its factorization.

15397973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 178605, while the sum is 44.

The square root of 15397973 is about 3924.0251018565. The cubic root of 15397973 is about 248.7832772833.

The spelling of 15397973 in words is "fifteen million, three hundred ninety-seven thousand, nine hundred seventy-three".