111439988 has 12 divisors (see below), whose sum is σ = 212749152. Its totient is φ = 50654520.

The previous prime is 111439969. The next prime is 111440027. The reversal of 111439988 is 889934111.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 2532727 = 111439988 / (1 + 1 + 1 + 4 + 3 + 9 + 9 + 8 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1266320 + ... + 1266407.

It is an arithmetic number, because the mean of its divisors is an integer number (17729096).

Almost surely, 2^111439988 is an apocalyptic number.

It is an amenable number.

111439988 is a deficient number, since it is larger than the sum of its proper divisors (101309164).

111439988 is a wasteful number, since it uses less digits than its factorization.

111439988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532742 (or 2532740 counting only the distinct ones).

The product of its digits is 62208, while the sum is 44.

The square root of 111439988 is about 10556.5140079479. The cubic root of 111439988 is about 481.2237121077.

The spelling of 111439988 in words is "one hundred eleven million, four hundred thirty-nine thousand, nine hundred eighty-eight".