1231400442 has 16 divisors (see below), whose sum is σ = 2463255360. Its totient is φ = 410391072.

The previous prime is 1231400419. The next prime is 1231400459. The reversal of 1231400442 is 2440041321.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23659 + ... + 54977.

It is an arithmetic number, because the mean of its divisors is an integer number (153953460).

Almost surely, 2^1231400442 is an apocalyptic number.

1231400442 is an abundant number, since it is smaller than the sum of its proper divisors (1231854918).

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

1231400442 is a wasteful number, since it uses less digits than its factorization.

1231400442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37877.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1231400442 is about 35091.3157633053. The cubic root of 1231400442 is about 1071.8477526834.

Adding to 1231400442 its reverse (2440041321), we get a palindrome (3671441763).

The spelling of 1231400442 in words is "one billion, two hundred thirty-one million, four hundred thousand, four hundred forty-two".