398681111 has 8 divisors (see below), whose sum is σ = 412051584. Its totient is φ = 385342560.

The previous prime is 398681099. The next prime is 398681137. The reversal of 398681111 is 111186893.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398681111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398681141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18905 + ... + 33981.

It is an arithmetic number, because the mean of its divisors is an integer number (51506448).

Almost surely, 2^398681111 is an apocalyptic number.

398681111 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

398681111 is a deficient number, since it is larger than the sum of its proper divisors (13370473).

398681111 is a wasteful number, since it uses less digits than its factorization.

398681111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15961.

The product of its digits is 10368, while the sum is 38.

The square root of 398681111 is about 19967.0005509090. Note that the first 3 decimals coincide. The cubic root of 398681111 is about 735.9956032888.

The spelling of 398681111 in words is "three hundred ninety-eight million, six hundred eighty-one thousand, one hundred eleven".