1211864208 has 40 divisors (see below), whose sum is σ = 3134555328. Its totient is φ = 403450752.

The previous prime is 1211864161. The next prime is 1211864221. The reversal of 1211864208 is 8024681121.

It is a super-2 number, since 2×1211864208² = 2937229717262934528, which contains 22 as substring.

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, 24166 + ... + 54842.

Almost surely, 2^1211864208 is an apocalyptic number.

It is an amenable number.

1211864208 is an abundant number, since it is smaller than the sum of its proper divisors (1922691120).

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

1211864208 is a wasteful number, since it uses less digits than its factorization.

1211864208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31511 (or 31505 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 1211864208 is about 34811.8400547860. The cubic root of 1211864208 is about 1066.1492023054.

The spelling of 1211864208 in words is "one billion, two hundred eleven million, eight hundred sixty-four thousand, two hundred eight".