1231900 has 36 divisors (see below), whose sum is σ = 2722048. Its totient is φ = 483840.

The previous prime is 1231889. The next prime is 1231943. The reversal of 1231900 is 91321.

It is a super-2 number, since 2×1231900² = 3035155220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9637 + ... + 9763.

2^1231900 is an apocalyptic number.

1231900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1361024).

1231900 is an abundant number, since it is smaller than the sum of its proper divisors (1490148).

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

1231900 is a wasteful number, since it uses less digits than its factorization.

1231900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238 (or 231 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1231900 is about 1109.9099062537. The cubic root of 1231900 is about 107.1992676493.

The spelling of 1231900 in words is "one million, two hundred thirty-one thousand, nine hundred".