390091 has 8 divisors (see below), whose sum is σ = 431984. Its totient is φ = 349920.

The previous prime is 390083. The next prime is 390097. The reversal of 390091 is 190093.

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

It is a 7-Lehmer number, since φ(390091) divides (390091-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 390091 - 2³ = 390083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76 + ... + 886.

It is an arithmetic number, because the mean of its divisors is an integer number (53998).

2³⁹⁰⁰⁹¹ is an apocalyptic number.

390091 is a deficient number, since it is larger than the sum of its proper divisors (41893).

390091 is a wasteful number, since it uses less digits than its factorization.

390091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861.

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 390091 is about 624.5726539002. The cubic root of 390091 is about 73.0671178548.

The spelling of 390091 in words is "three hundred ninety thousand, ninety-one".