387672689 has 2 divisors, whose sum is σ = 387672690. Its totient is φ = 387672688.

The previous prime is 387672683. The next prime is 387672757. The reversal of 387672689 is 986276783.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 299463025 + 88209664 = 17305^2 + 9392^2 .

It is a cyclic number.

It is not a de Polignac number, because 387672689 - 2²⁰ = 386624113 is a prime.

It is a super-2 number, since 2×387672689² = 300580227592981442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (387672683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193836344 + 193836345.

It is an arithmetic number, because the mean of its divisors is an integer number (193836345).

Almost surely, 2^387672689 is an apocalyptic number.

It is an amenable number.

387672689 is a deficient number, since it is larger than the sum of its proper divisors (1).

387672689 is an equidigital number, since it uses as much as digits as its factorization.

387672689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 56.

The square root of 387672689 is about 19689.4055014366. The cubic root of 387672689 is about 729.1581519521.

The spelling of 387672689 in words is "three hundred eighty-seven million, six hundred seventy-two thousand, six hundred eighty-nine".