1231032400 has 60 divisors (see below), whose sum is σ = 3185073052. Its totient is φ = 454533120.

The previous prime is 1231032371. The next prime is 1231032403. The reversal of 1231032400 is 42301321.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 157552704 + 1073479696 = 12552^2 + 32764^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231032403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113169 + ... + 123568.

Almost surely, 2^1231032400 is an apocalyptic number.

1231032400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231032400 is an abundant number, since it is smaller than the sum of its proper divisors (1954040652).

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

1231032400 is a wasteful number, since it uses less digits than its factorization.

1231032400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236768 (or 236757 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1231032400 is about 35086.0713104217. The cubic root of 1231032400 is about 1071.7409571236.

Adding to 1231032400 its reverse (42301321), we get a palindrome (1273333721).

The spelling of 1231032400 in words is "one billion, two hundred thirty-one million, thirty-two thousand, four hundred".