390809497 has 8 divisors (see below), whose sum is σ = 421166144. Its totient is φ = 360494928.

The previous prime is 390809453. The next prime is 390809509. The reversal of 390809497 is 794908093.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390809497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 390809497.

It is not an unprimeable number, because it can be changed into a prime (390809407) 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, 10318 + ... + 29800.

It is an arithmetic number, because the mean of its divisors is an integer number (52645768).

Almost surely, 2^390809497 is an apocalyptic number.

It is an amenable number.

390809497 is a deficient number, since it is larger than the sum of its proper divisors (30356647).

390809497 is a wasteful number, since it uses less digits than its factorization.

390809497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21039.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 390809497 is about 19768.9022709912. The cubic root of 390809497 is about 731.1195039057.

The spelling of 390809497 in words is "three hundred ninety million, eight hundred nine thousand, four hundred ninety-seven".