1139440 has 20 divisors (see below), whose sum is σ = 2649384. Its totient is φ = 455744.

The previous prime is 1139423. The next prime is 1139461. The reversal of 1139440 is 449311.

It is a tau number, because it is divible by the number of its divisors (20).

It is an Ulam number.

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, 7042 + ... + 7201.

2^1139440 is an apocalyptic number.

1139440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1139440 is an abundant number, since it is smaller than the sum of its proper divisors (1509944).

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

1139440 is a wasteful number, since it uses less digits than its factorization.

1139440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14256 (or 14250 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1139440 is about 1067.4455489626. The cubic root of 1139440 is about 104.4472845999.

The spelling of 1139440 in words is "one million, one hundred thirty-nine thousand, four hundred forty".