393436990 has 24 divisors (see below), whose sum is σ = 745977960. Its totient is φ = 148988304.

The previous prime is 393436961. The next prime is 393436999. The reversal of 393436990 is 99634393.

It is a self number, because there is not a number n which added to its sum of digits gives 393436990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393436999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 272691 + ... + 274129.

It is an arithmetic number, because the mean of its divisors is an integer number (31082415).

Almost surely, 2^393436990 is an apocalyptic number.

393436990 is a deficient number, since it is larger than the sum of its proper divisors (352540970).

393436990 is an equidigital number, since it uses as much as digits as its factorization.

393436990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2904 (or 1465 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 46.

The square root of 393436990 is about 19835.2461542578. The cubic root of 393436990 is about 732.7543347572.

The spelling of 393436990 in words is "three hundred ninety-three million, four hundred thirty-six thousand, nine hundred ninety".