390961 has 2 divisors, whose sum is σ = 390962. Its totient is φ = 390960.

The previous prime is 390959. The next prime is 390967. The reversal of 390961 is 169093.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 384400 + 6561 = 620^2 + 81^2 .

It is an emirp because it is prime and its reverse (169093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 390961 - 2¹ = 390959 is a prime.

Together with 390959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (390967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195480 + 195481.

It is an arithmetic number, because the mean of its divisors is an integer number (195481).

2³⁹⁰⁹⁶¹ is an apocalyptic number.

It is an amenable number.

390961 is a deficient number, since it is larger than the sum of its proper divisors (1).

390961 is an equidigital number, since it uses as much as digits as its factorization.

390961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 390961 is about 625.2687422221. The cubic root of 390961 is about 73.1213968079.

The spelling of 390961 in words is "three hundred ninety thousand, nine hundred sixty-one".