393981090 has 16 divisors (see below), whose sum is σ = 945554688. Its totient is φ = 105061616.

The previous prime is 393981079. The next prime is 393981097. The reversal of 393981090 is 90189393.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (393981097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6566322 + ... + 6566381.

It is an arithmetic number, because the mean of its divisors is an integer number (59097168).

Almost surely, 2^393981090 is an apocalyptic number.

393981090 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

393981090 is an abundant number, since it is smaller than the sum of its proper divisors (551573598).

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

393981090 is a wasteful number, since it uses less digits than its factorization.

393981090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13132713.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 393981090 is about 19848.9568995451. The cubic root of 393981090 is about 733.0919644123.

The spelling of 393981090 in words is "three hundred ninety-three million, nine hundred eighty-one thousand, ninety".