387694691 has 2 divisors, whose sum is σ = 387694692. Its totient is φ = 387694690.

The previous prime is 387694613. The next prime is 387694709. The reversal of 387694691 is 196496783.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 387694691 - 2¹⁰ = 387693667 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (387694891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193847345 + 193847346.

It is an arithmetic number, because the mean of its divisors is an integer number (193847346).

Almost surely, 2^387694691 is an apocalyptic number.

387694691 is a deficient number, since it is larger than the sum of its proper divisors (1).

387694691 is an equidigital number, since it uses as much as digits as its factorization.

387694691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 387694691 is about 19689.9642203839. The cubic root of 387694691 is about 729.1719459202.

The spelling of 387694691 in words is "three hundred eighty-seven million, six hundred ninety-four thousand, six hundred ninety-one".