111961840 has 40 divisors (see below), whose sum is σ = 264590208. Its totient is φ = 44048640.

The previous prime is 111961807. The next prime is 111961841. The reversal of 111961840 is 48169111.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111961841) 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, 6592 + ... + 16351.

Almost surely, 2^111961840 is an apocalyptic number.

111961840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111961840 is an abundant number, since it is smaller than the sum of its proper divisors (152628368).

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

111961840 is a wasteful number, since it uses less digits than its factorization.

111961840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23017 (or 23011 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 111961840 is about 10581.2022001283. The cubic root of 111961840 is about 481.9737019564.

The spelling of 111961840 in words is "one hundred eleven million, nine hundred sixty-one thousand, eight hundred forty".