386720331 has 4 divisors (see below), whose sum is σ = 515627112. Its totient is φ = 257813552.

The previous prime is 386720317. The next prime is 386720333. The reversal of 386720331 is 133027683.

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

It is a cyclic number.

It is not a de Polignac number, because 386720331 - 2⁷ = 386720203 is a prime.

It is a super-2 number, since 2×386720331² = 299105228817499122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 386720292 and 386720301.

It is not an unprimeable number, because it can be changed into a prime (386720333) 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, 64453386 + ... + 64453391.

It is an arithmetic number, because the mean of its divisors is an integer number (128906778).

Almost surely, 2^386720331 is an apocalyptic number.

386720331 is a deficient number, since it is larger than the sum of its proper divisors (128906781).

386720331 is a wasteful number, since it uses less digits than its factorization.

386720331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128906780.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 386720331 is about 19665.2061011320. The cubic root of 386720331 is about 728.5605782478.

The spelling of 386720331 in words is "three hundred eighty-six million, seven hundred twenty thousand, three hundred thirty-one".