1139281 has 16 divisors (see below), whose sum is σ = 1387008. Its totient is φ = 921600.

The previous prime is 1139273. The next prime is 1139287. The reversal of 1139281 is 1829311.

1139281 is nontrivially palindromic in base 4.

It is a 3-Lehmer number, since φ(1139281) divides (1139281-1)³.

It is a cyclic number.

It is not a de Polignac number, because 1139281 - 2³ = 1139273 is a prime.

It is a super-2 number, since 2×1139281² = 2595922393922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4305 + ... + 4561.

It is an arithmetic number, because the mean of its divisors is an integer number (86688).

It is a Poulet number, since it divides 2^1139280-1.

2^1139281 is an apocalyptic number.

1139281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1139281 is a deficient number, since it is larger than the sum of its proper divisors (247727).

1139281 is a wasteful number, since it uses less digits than its factorization.

1139281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312.

The product of its digits is 432, while the sum is 25.

The square root of 1139281 is about 1067.3710694974. The cubic root of 1139281 is about 104.4424261049.

The spelling of 1139281 in words is "one million, one hundred thirty-nine thousand, two hundred eighty-one".