399000381 has 12 divisors (see below), whose sum is σ = 576072288. Its totient is φ = 245538384.

The previous prime is 399000347. The next prime is 399000383. The reversal of 399000381 is 183000993.

It is not a de Polignac number, because 399000381 - 2¹³ = 398992189 is a prime.

It is a super-2 number, since 2×399000381² = 318402608076290322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399000383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 392985 + ... + 393998.

It is an arithmetic number, because the mean of its divisors is an integer number (48006024).

Almost surely, 2^399000381 is an apocalyptic number.

It is an amenable number.

399000381 is a deficient number, since it is larger than the sum of its proper divisors (177071907).

399000381 is a wasteful number, since it uses less digits than its factorization.

399000381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787012 (or 786999 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 399000381 is about 19974.9938923645. The cubic root of 399000381 is about 736.1920164221.

The spelling of 399000381 in words is "three hundred ninety-nine million, three hundred eighty-one", and thus it is an aban number.