391899122 has 8 divisors (see below), whose sum is σ = 597812400. Its totient is φ = 192628324.

The previous prime is 391899121. The next prime is 391899133. The reversal of 391899122 is 221998193.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (391899121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1660472 + ... + 1660707.

It is an arithmetic number, because the mean of its divisors is an integer number (74726550).

Almost surely, 2^391899122 is an apocalyptic number.

391899122 is a deficient number, since it is larger than the sum of its proper divisors (205913278).

391899122 is a wasteful number, since it uses less digits than its factorization.

391899122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321240.

The product of its digits is 69984, while the sum is 44.

The square root of 391899122 is about 19796.4421550944. The cubic root of 391899122 is about 731.7983571217.

The spelling of 391899122 in words is "three hundred ninety-one million, eight hundred ninety-nine thousand, one hundred twenty-two".