15438791 has 2 divisors, whose sum is σ = 15438792. Its totient is φ = 15438790.

The previous prime is 15438781. The next prime is 15438799. The reversal of 15438791 is 19783451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15438791 - 2¹⁰ = 15437767 is a prime.

It is a Chen prime.

It is equal to p₉₉₇₁₅₇ and since 15438791 and 997157 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15438799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7719395 + 7719396.

It is an arithmetic number, because the mean of its divisors is an integer number (7719396).

Almost surely, 2^15438791 is an apocalyptic number.

15438791 is a deficient number, since it is larger than the sum of its proper divisors (1).

15438791 is an equidigital number, since it uses as much as digits as its factorization.

15438791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 15438791 is about 3929.2226966666. Note that the first 3 decimals coincide. The cubic root of 15438791 is about 249.0029138974.

The spelling of 15438791 in words is "fifteen million, four hundred thirty-eight thousand, seven hundred ninety-one".