390641 has 4 divisors (see below), whose sum is σ = 394212. Its totient is φ = 387072.

The previous prime is 390581. The next prime is 390647. The reversal of 390641 is 146093.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6241 + 384400 = 79^2 + 620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (390647) 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 3 ways as a sum of consecutive naturals, for example, 1616 + ... + 1841.

It is an arithmetic number, because the mean of its divisors is an integer number (98553).

2³⁹⁰⁶⁴¹ is an apocalyptic number.

It is an amenable number.

390641 is a deficient number, since it is larger than the sum of its proper divisors (3571).

390641 is a wasteful number, since it uses less digits than its factorization.

390641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3570.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 390641 is about 625.0127998689. The cubic root of 390641 is about 73.1014415064.

The spelling of 390641 in words is "three hundred ninety thousand, six hundred forty-one".