386722661 has 4 divisors (see below), whose sum is σ = 416470572. Its totient is φ = 356974752.

The previous prime is 386722657. The next prime is 386722663. The reversal of 386722661 is 166227683.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 130530625 + 256192036 = 11425^2 + 16006^2 .

It is a cyclic number.

It is not a de Polignac number, because 386722661 - 2² = 386722657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (386722663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14873936 + ... + 14873961.

It is an arithmetic number, because the mean of its divisors is an integer number (104117643).

Almost surely, 2^386722661 is an apocalyptic number.

It is an amenable number.

386722661 is a deficient number, since it is larger than the sum of its proper divisors (29747911).

386722661 is a wasteful number, since it uses less digits than its factorization.

386722661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29747910.

The product of its digits is 145152, while the sum is 41.

The square root of 386722661 is about 19665.2653427306. The cubic root of 386722661 is about 728.5620414437.

The spelling of 386722661 in words is "three hundred eighty-six million, seven hundred twenty-two thousand, six hundred sixty-one".