390919 has 4 divisors (see below), whose sum is σ = 392896. Its totient is φ = 388944.

The previous prime is 390893. The next prime is 390953. The reversal of 390919 is 919093.

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 390919 - 2⁷ = 390791 is a prime.

It is a super-2 number, since 2×390919² = 305635329122, which contains 22 as substring.

It is a Duffinian number.

390919 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390959) 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, 654 + ... + 1099.

It is an arithmetic number, because the mean of its divisors is an integer number (98224).

2³⁹⁰⁹¹⁹ is an apocalyptic number.

390919 is a deficient number, since it is larger than the sum of its proper divisors (1977).

390919 is a wasteful number, since it uses less digits than its factorization.

390919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976.

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 390919 is about 625.2351557614. The cubic root of 390919 is about 73.1187782955.

The spelling of 390919 in words is "three hundred ninety thousand, nine hundred nineteen".