111243990 has 64 divisors (see below), whose sum is σ = 313673472. Its totient is φ = 24892800.

The previous prime is 111243989. The next prime is 111244009. The reversal of 111243990 is 99342111.

It is a super-2 number, since 2×111243990² = 24750450622240200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8676 + ... + 17255.

It is an arithmetic number, because the mean of its divisors is an integer number (4901148).

Almost surely, 2^111243990 is an apocalyptic number.

111243990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111243990 is an abundant number, since it is smaller than the sum of its proper divisors (202429482).

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

111243990 is a wasteful number, since it uses less digits than its factorization.

111243990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25965.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 111243990 is about 10547.2266496933. The cubic root of 111243990 is about 480.9414249437.

The spelling of 111243990 in words is "one hundred eleven million, two hundred forty-three thousand, nine hundred ninety".