111957990 has 16 divisors (see below), whose sum is σ = 268699248. Its totient is φ = 29855456.

The previous prime is 111957973. The next prime is 111957991. The reversal of 111957990 is 99759111.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111957991) 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, 1865937 + ... + 1865996.

It is an arithmetic number, because the mean of its divisors is an integer number (16793703).

Almost surely, 2^111957990 is an apocalyptic number.

111957990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111957990 is an abundant number, since it is smaller than the sum of its proper divisors (156741258).

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

111957990 is a wasteful number, since it uses less digits than its factorization.

111957990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3731943.

The product of its (nonzero) digits is 25515, while the sum is 42.

The square root of 111957990 is about 10581.0202721666. The cubic root of 111957990 is about 481.9681773955.

The spelling of 111957990 in words is "one hundred eleven million, nine hundred fifty-seven thousand, nine hundred ninety".