1392487157 has 2 divisors, whose sum is σ = 1392487158. Its totient is φ = 1392487156.

The previous prime is 1392487133. The next prime is 1392487231. The reversal of 1392487157 is 7517842931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1359470641 + 33016516 = 36871^2 + 5746^2 .

It is a cyclic number.

It is not a de Polignac number, because 1392487157 - 2¹⁴ = 1392470773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1392487457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696243578 + 696243579.

It is an arithmetic number, because the mean of its divisors is an integer number (696243579).

Almost surely, 2^1392487157 is an apocalyptic number.

It is an amenable number.

1392487157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1392487157 is an equidigital number, since it uses as much as digits as its factorization.

1392487157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 47.

The square root of 1392487157 is about 37316.0442303307. The cubic root of 1392487157 is about 1116.6842722800.

The spelling of 1392487157 in words is "one billion, three hundred ninety-two million, four hundred eighty-seven thousand, one hundred fifty-seven".