391329090 has 32 divisors (see below), whose sum is σ = 1043544960. Its totient is φ = 104354352.

The previous prime is 391329079. The next prime is 391329119. The reversal of 391329090 is 90923193.

391329090 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 724414 + ... + 724953.

It is an arithmetic number, because the mean of its divisors is an integer number (32610780).

Almost surely, 2^391329090 is an apocalyptic number.

391329090 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

391329090 is an abundant number, since it is smaller than the sum of its proper divisors (652215870).

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

391329090 is a wasteful number, since it uses less digits than its factorization.

391329090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449383 (or 1449377 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 391329090 is about 19782.0395813981. The cubic root of 391329090 is about 731.4433755512.

The spelling of 391329090 in words is "three hundred ninety-one million, three hundred twenty-nine thousand, ninety".