1391990147 has 2 divisors, whose sum is σ = 1391990148. Its totient is φ = 1391990146.

The previous prime is 1391990143. The next prime is 1391990167. The reversal of 1391990147 is 7410991931.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1391990147 - 2² = 1391990143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1391990098 and 1391990107.

It is not a weakly prime, because it can be changed into another prime (1391990143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695995073 + 695995074.

It is an arithmetic number, because the mean of its divisors is an integer number (695995074).

Almost surely, 2^1391990147 is an apocalyptic number.

1391990147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391990147 is an equidigital number, since it uses as much as digits as its factorization.

1391990147 is an evil number, because the sum of its binary digits is even.

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

The square root of 1391990147 is about 37309.3841680615. The cubic root of 1391990147 is about 1116.5513998890.

The spelling of 1391990147 in words is "one billion, three hundred ninety-one million, nine hundred ninety thousand, one hundred forty-seven".