15949397 has 2 divisors, whose sum is σ = 15949398. Its totient is φ = 15949396.

The previous prime is 15949393. The next prime is 15949399. The reversal of 15949397 is 79394951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15928081 + 21316 = 3991^2 + 146^2 .

It is an emirp because it is prime and its reverse (79394951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15949397 - 2² = 15949393 is a prime.

Together with 15949399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15949393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7974698 + 7974699.

It is an arithmetic number, because the mean of its divisors is an integer number (7974699).

Almost surely, 2^15949397 is an apocalyptic number.

It is an amenable number.

15949397 is a deficient number, since it is larger than the sum of its proper divisors (1).

15949397 is an equidigital number, since it uses as much as digits as its factorization.

15949397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 47.

The square root of 15949397 is about 3993.6696157795. The cubic root of 15949397 is about 251.7182803271.

The spelling of 15949397 in words is "fifteen million, nine hundred forty-nine thousand, three hundred ninety-seven".