390146891 has 2 divisors, whose sum is σ = 390146892. Its totient is φ = 390146890.

The previous prime is 390146879. The next prime is 390146987. The reversal of 390146891 is 198641093.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390146891 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (395146891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195073445 + 195073446.

It is an arithmetic number, because the mean of its divisors is an integer number (195073446).

Almost surely, 2^390146891 is an apocalyptic number.

390146891 is a deficient number, since it is larger than the sum of its proper divisors (1).

390146891 is an equidigital number, since it uses as much as digits as its factorization.

390146891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 390146891 is about 19752.1363654669. The cubic root of 390146891 is about 730.7060729640.

The spelling of 390146891 in words is "three hundred ninety million, one hundred forty-six thousand, eight hundred ninety-one".