1231213400 has 24 divisors (see below), whose sum is σ = 2862571620. Its totient is φ = 492485280.

The previous prime is 1231213393. The next prime is 1231213411. The reversal of 1231213400 is 43121321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3077834 + ... + 3078233.

Almost surely, 2^1231213400 is an apocalyptic number.

1231213400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231213400 is an abundant number, since it is smaller than the sum of its proper divisors (1631358220).

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

1231213400 is a wasteful number, since it uses less digits than its factorization.

1231213400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6156083 (or 6156074 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1231213400 is about 35088.6505867638. The cubic root of 1231213400 is about 1071.7934809529.

Adding to 1231213400 its reverse (43121321), we get a palindrome (1274334721).

The spelling of 1231213400 in words is "one billion, two hundred thirty-one million, two hundred thirteen thousand, four hundred".