390499381 has 8 divisors (see below), whose sum is σ = 411235200. Its totient is φ = 369781920.

The previous prime is 390499363. The next prime is 390499387. The reversal of 390499381 is 183994093.

390499381 = 1794² + 1795² + ... + 1907².

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 390499381 - 2⁹ = 390498869 is a prime.

It is a super-2 number, since 2×390499381² = 304979533122766322, 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 (390499387) 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, 72036 + ... + 77266.

It is an arithmetic number, because the mean of its divisors is an integer number (51404400).

Almost surely, 2^390499381 is an apocalyptic number.

It is an amenable number.

390499381 is a deficient number, since it is larger than the sum of its proper divisors (20735819).

390499381 is a wasteful number, since it uses less digits than its factorization.

390499381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9179.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 390499381 is about 19761.0571832582. The cubic root of 390499381 is about 730.9260662193.

It can be divided in two parts, 3904 and 99381, that added together give a triangular number (103285 = T₄₅₄).

The spelling of 390499381 in words is "three hundred ninety million, four hundred ninety-nine thousand, three hundred eighty-one".