1211199972 has 24 divisors (see below), whose sum is σ = 2826696096. Its totient is φ = 403652928.

The previous prime is 1211199971. The next prime is 1211200009. The reversal of 1211199972 is 2799911121.

It is not an unprimeable number, because it can be changed into a prime (1211199971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112288 + ... + 122600.

It is an arithmetic number, because the mean of its divisors is an integer number (117779004).

Almost surely, 2^1211199972 is an apocalyptic number.

1211199972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211199972 is an abundant number, since it is smaller than the sum of its proper divisors (1615496124).

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

1211199972 is a wasteful number, since it uses less digits than its factorization.

1211199972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20107 (or 20105 counting only the distinct ones).

The product of its digits is 20412, while the sum is 42.

The square root of 1211199972 is about 34802.2983723776. The cubic root of 1211199972 is about 1065.9543773676.

The spelling of 1211199972 in words is "one billion, two hundred eleven million, one hundred ninety-nine thousand, nine hundred seventy-two".