1231140402 has 48 divisors (see below), whose sum is σ = 2689794432. Its totient is φ = 406962720.

The previous prime is 1231140373. The next prime is 1231140403. The reversal of 1231140402 is 2040411321.

1231140402 is a `hidden beast` number, since 123 + 1 + 140 + 402 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1231140403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1499152 + ... + 1499972.

It is an arithmetic number, because the mean of its divisors is an integer number (56037384).

Almost surely, 2^1231140402 is an apocalyptic number.

1231140402 is an abundant number, since it is smaller than the sum of its proper divisors (1458654030).

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

1231140402 is a wasteful number, since it uses less digits than its factorization.

1231140402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423 (or 1420 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1231140402 is about 35087.6103774537. The cubic root of 1231140402 is about 1071.7722985088.

Adding to 1231140402 its reverse (2040411321), we get a palindrome (3271551723).

The spelling of 1231140402 in words is "one billion, two hundred thirty-one million, one hundred forty thousand, four hundred two".