1390051639 has 2 divisors, whose sum is σ = 1390051640. Its totient is φ = 1390051638.

The previous prime is 1390051589. The next prime is 1390051651. The reversal of 1390051639 is 9361500931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1390051639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1390051598 and 1390051607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1390051339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695025819 + 695025820.

It is an arithmetic number, because the mean of its divisors is an integer number (695025820).

Almost surely, 2^1390051639 is an apocalyptic number.

1390051639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390051639 is an equidigital number, since it uses as much as digits as its factorization.

1390051639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 1390051639 is about 37283.3962911106. The cubic root of 1390051639 is about 1116.0328499192.

The spelling of 1390051639 in words is "one billion, three hundred ninety million, fifty-one thousand, six hundred thirty-nine".