1139868 has 18 divisors (see below), whose sum is σ = 2881424. Its totient is φ = 379944.

The previous prime is 1139863. The next prime is 1139869. The reversal of 1139868 is 8689311.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 31663 = 1139868 / (1 + 1 + 3 + 9 + 8 + 6 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15796 + ... + 15867.

2^1139868 is an apocalyptic number.

1139868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1139868 is an abundant number, since it is smaller than the sum of its proper divisors (1741556).

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

1139868 is a wasteful number, since it uses less digits than its factorization.

1139868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31673 (or 31668 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1139868 is about 1067.6460087501. The cubic root of 1139868 is about 104.4603605676.

The spelling of 1139868 in words is "one million, one hundred thirty-nine thousand, eight hundred sixty-eight".