1392724457 has 2 divisors, whose sum is σ = 1392724458. Its totient is φ = 1392724456.

The previous prime is 1392724447. The next prime is 1392724481. The reversal of 1392724457 is 7544272931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1269425641 + 123298816 = 35629^2 + 11104^2 .

It is a cyclic number.

It is not a de Polignac number, because 1392724457 - 2⁶ = 1392724393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1392724447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696362228 + 696362229.

It is an arithmetic number, because the mean of its divisors is an integer number (696362229).

Almost surely, 2^1392724457 is an apocalyptic number.

It is an amenable number.

1392724457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1392724457 is an equidigital number, since it uses as much as digits as its factorization.

1392724457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 44.

The square root of 1392724457 is about 37319.2236923546. The cubic root of 1392724457 is about 1116.7477017403.

The spelling of 1392724457 in words is "one billion, three hundred ninety-two million, seven hundred twenty-four thousand, four hundred fifty-seven".