1212312144 has 40 divisors (see below), whose sum is σ = 3148227072. Its totient is φ = 401985280.

The previous prime is 1212312139. The next prime is 1212312161. The reversal of 1212312144 is 4412132121.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1212312144.

It is a congruent number.

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, 56949 + ... + 75284.

Almost surely, 2^1212312144 is an apocalyptic number.

It is an amenable number.

1212312144 is an abundant number, since it is smaller than the sum of its proper divisors (1935914928).

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

1212312144 is a wasteful number, since it uses less digits than its factorization.

1212312144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132435 (or 132429 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 1212312144 is about 34818.2731335142. The cubic root of 1212312144 is about 1066.2805447935.

Adding to 1212312144 its reverse (4412132121), we get a palindrome (5624444265).

The spelling of 1212312144 in words is "one billion, two hundred twelve million, three hundred twelve thousand, one hundred forty-four".