390775 has 36 divisors (see below), whose sum is σ = 636120. Its totient is φ = 235200.

The previous prime is 390763. The next prime is 390781. The reversal of 390775 is 577093.

390775 = T₁₀₁ + T₁₀₂ + ... + T₁₄₉.

It is not a de Polignac number, because 390775 - 2⁵ = 390743 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13461 + ... + 13489.

It is an arithmetic number, because the mean of its divisors is an integer number (17670).

2³⁹⁰⁷⁷⁵ is an apocalyptic number.

390775 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

390775 is a deficient number, since it is larger than the sum of its proper divisors (245345).

390775 is a wasteful number, since it uses less digits than its factorization.

390775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 6615, while the sum is 31.

The square root of 390775 is about 625.1199884822. The cubic root of 390775 is about 73.1097991147.

The spelling of 390775 in words is "three hundred ninety thousand, seven hundred seventy-five".