391400294387 has 2 divisors, whose sum is σ = 391400294388. Its totient is φ = 391400294386.

The previous prime is 391400294371. The next prime is 391400294407. The reversal of 391400294387 is 783492004193.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 391400294387 - 2⁴ = 391400294371 is a prime.

It is not a weakly prime, because it can be changed into another prime (391400294687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195700147193 + 195700147194.

It is an arithmetic number, because the mean of its divisors is an integer number (195700147194).

Almost surely, 2^391400294387 is an apocalyptic number.

391400294387 is a deficient number, since it is larger than the sum of its proper divisors (1).

391400294387 is an equidigital number, since it uses as much as digits as its factorization.

391400294387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 391400294387 in words is "three hundred ninety-one billion, four hundred million, two hundred ninety-four thousand, three hundred eighty-seven".