1231402212 has 144 divisors (see below), whose sum is σ = 3321077760. Its totient is φ = 384134400.

The previous prime is 1231402199. The next prime is 1231402247. The reversal of 1231402212 is 2122041321.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6447037 + ... + 6447227.

It is an arithmetic number, because the mean of its divisors is an integer number (23063040).

Almost surely, 2^1231402212 is an apocalyptic number.

1231402212 is a gapful number since it is divisible by the number (12) 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 1231402212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1660538880).

1231402212 is an abundant number, since it is smaller than the sum of its proper divisors (2089675548).

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

1231402212 is a wasteful number, since it uses less digits than its factorization.

1231402212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 389 counting only the distinct ones).

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

The square root of 1231402212 is about 35091.3409832112. The cubic root of 1231402212 is about 1071.8482662368.

Adding to 1231402212 its reverse (2122041321), we get a palindrome (3353443533).

The spelling of 1231402212 in words is "one billion, two hundred thirty-one million, four hundred two thousand, two hundred twelve".