390778593 has 8 divisors (see below), whose sum is σ = 530869248. Its totient is φ = 255603504.

The previous prime is 390778547. The next prime is 390778631. The reversal of 390778593 is 395877093.

It is a happy number.

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

It is not a de Polignac number, because 390778593 - 2⁹ = 390778081 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (390778543) 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, 1228705 + ... + 1229022.

It is an arithmetic number, because the mean of its divisors is an integer number (66358656).

Almost surely, 2^390778593 is an apocalyptic number.

It is an amenable number.

390778593 is a deficient number, since it is larger than the sum of its proper divisors (140090655).

390778593 is a wasteful number, since it uses less digits than its factorization.

390778593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2457783.

The product of its (nonzero) digits is 1428840, while the sum is 51.

The square root of 390778593 is about 19768.1206238732. The cubic root of 390778593 is about 731.1002318453.

The spelling of 390778593 in words is "three hundred ninety million, seven hundred seventy-eight thousand, five hundred ninety-three".