15400949 has 2 divisors, whose sum is σ = 15400950. Its totient is φ = 15400948.

The previous prime is 15400939. The next prime is 15400951. The reversal of 15400949 is 94900451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9878449 + 5522500 = 3143^2 + 2350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15400949 is a prime.

Together with 15400951, 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 (15400939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7700474 + 7700475.

It is an arithmetic number, because the mean of its divisors is an integer number (7700475).

Almost surely, 2^15400949 is an apocalyptic number.

It is an amenable number.

15400949 is a deficient number, since it is larger than the sum of its proper divisors (1).

15400949 is an equidigital number, since it uses as much as digits as its factorization.

15400949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 15400949 is about 3924.4042860032. The cubic root of 15400949 is about 248.7993038807.

The spelling of 15400949 in words is "fifteen million, four hundred thousand, nine hundred forty-nine".