390745 has 8 divisors (see below), whose sum is σ = 496584. Its totient is φ = 294144.

The previous prime is 390743. The next prime is 390751. The reversal of 390745 is 547093.

It can be written as a sum of positive squares in 4 ways, for example, as 17424 + 373321 = 132^2 + 611^2 .

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 390745 - 2¹ = 390743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390743) 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, 2214 + ... + 2383.

It is an arithmetic number, because the mean of its divisors is an integer number (62073).

2³⁹⁰⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

390745 is a deficient number, since it is larger than the sum of its proper divisors (105839).

390745 is a wasteful number, since it uses less digits than its factorization.

390745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4619.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 390745 is about 625.0959926283. The cubic root of 390745 is about 73.1079281743.

The spelling of 390745 in words is "three hundred ninety thousand, seven hundred forty-five".