1131870 has 32 divisors (see below), whose sum is σ = 2812320. Its totient is φ = 291200.

The previous prime is 1131869. The next prime is 1131881. The reversal of 1131870 is 781311.

It is a super-2 number, since 2×1131870² = 2562259393800, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220 + ... + 1520.

It is an arithmetic number, because the mean of its divisors is an integer number (87885).

2^1131870 is an apocalyptic number.

1131870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1131870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1406160).

1131870 is an abundant number, since it is smaller than the sum of its proper divisors (1680450).

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

1131870 is a wasteful number, since it uses less digits than its factorization.

1131870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 1131870 is about 1063.8937916916. The cubic root of 1131870 is about 104.2154679778.

The spelling of 1131870 in words is "one million, one hundred thirty-one thousand, eight hundred seventy".