1212311604 has 24 divisors (see below), whose sum is σ = 3232831168. Its totient is φ = 346374720.

The previous prime is 1212311603. The next prime is 1212311629. The reversal of 1212311604 is 4061132121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212311603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7216057 + ... + 7216224.

Almost surely, 2^1212311604 is an apocalyptic number.

1212311604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1212311604 is an abundant number, since it is smaller than the sum of its proper divisors (2020519564).

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

1212311604 is a wasteful number, since it uses less digits than its factorization.

1212311604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14432295 (or 14432293 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1212311604 is about 34818.2653789645. The cubic root of 1212311604 is about 1066.2803864758.

Adding to 1212311604 its reverse (4061132121), we get a palindrome (5273443725).

The spelling of 1212311604 in words is "one billion, two hundred twelve million, three hundred eleven thousand, six hundred four".