15438457 has 2 divisors, whose sum is σ = 15438458. Its totient is φ = 15438456.

The previous prime is 15438323. The next prime is 15438473. The reversal of 15438457 is 75483451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13424896 + 2013561 = 3664^2 + 1419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15438457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15438487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7719228 + 7719229.

It is an arithmetic number, because the mean of its divisors is an integer number (7719229).

Almost surely, 2^15438457 is an apocalyptic number.

It is an amenable number.

15438457 is a deficient number, since it is larger than the sum of its proper divisors (1).

15438457 is an equidigital number, since it uses as much as digits as its factorization.

15438457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 37.

The square root of 15438457 is about 3929.1801943917. The cubic root of 15438457 is about 249.0011182565.

It can be divided in two parts, 1543 and 8457, that added together give a 4-th power (10000 = 10⁴).

The spelling of 15438457 in words is "fifteen million, four hundred thirty-eight thousand, four hundred fifty-seven".