15739421 has 2 divisors, whose sum is σ = 15739422. Its totient is φ = 15739420.

The previous prime is 15739397. The next prime is 15739441. The reversal of 15739421 is 12493751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10310521 + 5428900 = 3211^2 + 2330^2 .

It is a cyclic number.

It is not a de Polignac number, because 15739421 - 2¹⁰ = 15738397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15739441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7869710 + 7869711.

It is an arithmetic number, because the mean of its divisors is an integer number (7869711).

Almost surely, 2^15739421 is an apocalyptic number.

It is an amenable number.

15739421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15739421 is an equidigital number, since it uses as much as digits as its factorization.

15739421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 32.

The square root of 15739421 is about 3967.2939139923. The cubic root of 15739421 is about 250.6087617666.

The spelling of 15739421 in words is "fifteen million, seven hundred thirty-nine thousand, four hundred twenty-one".