386408821 has 8 divisors (see below), whose sum is σ = 389537280. Its totient is φ = 383290992.

The previous prime is 386408807. The next prime is 386408863. The reversal of 386408821 is 128804683.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 386408821 - 2¹⁹ = 385884533 is a prime.

It is a super-2 number, since 2×386408821² = 298623553893220082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (386408801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80536 + ... + 85198.

It is an arithmetic number, because the mean of its divisors is an integer number (48692160).

Almost surely, 2^386408821 is an apocalyptic number.

It is an amenable number.

386408821 is a deficient number, since it is larger than the sum of its proper divisors (3128459).

386408821 is a wasteful number, since it uses less digits than its factorization.

386408821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5315.

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 386408821 is about 19657.2841715228. The cubic root of 386408821 is about 728.3649029296.

The spelling of 386408821 in words is "three hundred eighty-six million, four hundred eight thousand, eight hundred twenty-one".