1390506757 has 2 divisors, whose sum is σ = 1390506758. Its totient is φ = 1390506756.

The previous prime is 1390506751. The next prime is 1390506763. The reversal of 1390506757 is 7576050931.

It is a balanced prime because it is at equal distance from previous prime (1390506751) and next prime (1390506763).

It can be written as a sum of positive squares in only one way, i.e., 895266241 + 495240516 = 29921^2 + 22254^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390506757 - 2¹⁵ = 1390473989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1390506751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695253378 + 695253379.

It is an arithmetic number, because the mean of its divisors is an integer number (695253379).

Almost surely, 2^1390506757 is an apocalyptic number.

It is an amenable number.

1390506757 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390506757 is an equidigital number, since it uses as much as digits as its factorization.

1390506757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 198450, while the sum is 43.

The square root of 1390506757 is about 37289.4992859920. The cubic root of 1390506757 is about 1116.1546370531.

The spelling of 1390506757 in words is "one billion, three hundred ninety million, five hundred six thousand, seven hundred fifty-seven".