386640407 has 2 divisors, whose sum is σ = 386640408. Its totient is φ = 386640406.

The previous prime is 386640347. The next prime is 386640413. The reversal of 386640407 is 704046683.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (704046683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 386640407 - 2²⁰ = 385591831 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (386640427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193320203 + 193320204.

It is an arithmetic number, because the mean of its divisors is an integer number (193320204).

Almost surely, 2^386640407 is an apocalyptic number.

386640407 is a deficient number, since it is larger than the sum of its proper divisors (1).

386640407 is an equidigital number, since it uses as much as digits as its factorization.

386640407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 386640407 is about 19663.1738791071. The cubic root of 386640407 is about 728.5103839317.

The spelling of 386640407 in words is "three hundred eighty-six million, six hundred forty thousand, four hundred seven".