1211629872 has 20 divisors (see below), whose sum is σ = 3130043960. Its totient is φ = 403876608.

The previous prime is 1211629871. The next prime is 1211629897. The reversal of 1211629872 is 2789261121.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1211629872.

It is not an unprimeable number, because it can be changed into a prime (1211629871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12621097 + ... + 12621192.

It is an arithmetic number, because the mean of its divisors is an integer number (156502198).

Almost surely, 2^1211629872 is an apocalyptic number.

1211629872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211629872 is an abundant number, since it is smaller than the sum of its proper divisors (1918414088).

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

1211629872 is a wasteful number, since it uses less digits than its factorization.

1211629872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25242300 (or 25242294 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The square root of 1211629872 is about 34808.4741406457. The cubic root of 1211629872 is about 1066.0804780916.

The spelling of 1211629872 in words is "one billion, two hundred eleven million, six hundred twenty-nine thousand, eight hundred seventy-two".