390809790 has 144 divisors (see below), whose sum is σ = 1233711648. Its totient is φ = 85421952.

The previous prime is 390809743. The next prime is 390809819. The reversal of 390809790 is 97908093.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 99504 + ... + 103356.

It is an arithmetic number, because the mean of its divisors is an integer number (8567442).

Almost surely, 2^390809790 is an apocalyptic number.

390809790 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 390809790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (616855824).

390809790 is an abundant number, since it is smaller than the sum of its proper divisors (842901858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

390809790 is a wasteful number, since it uses less digits than its factorization.

390809790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3903 (or 3893 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 390809790 is about 19768.9096816188. The cubic root of 390809790 is about 731.1196866187.

The spelling of 390809790 in words is "three hundred ninety million, eight hundred nine thousand, seven hundred ninety".