1390141979 has 2 divisors, whose sum is σ = 1390141980. Its totient is φ = 1390141978.

The previous prime is 1390141957. The next prime is 1390142069. The reversal of 1390141979 is 9791410931.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1390141979 - 2¹² = 1390137883 is a prime.

It is not a weakly prime, because it can be changed into another prime (1390141939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695070989 + 695070990.

It is an arithmetic number, because the mean of its divisors is an integer number (695070990).

Almost surely, 2^1390141979 is an apocalyptic number.

1390141979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390141979 is an equidigital number, since it uses as much as digits as its factorization.

1390141979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 44.

The square root of 1390141979 is about 37284.6078026845. The cubic root of 1390141979 is about 1116.0570265327.

The spelling of 1390141979 in words is "one billion, three hundred ninety million, one hundred forty-one thousand, nine hundred seventy-nine".