1211905968 has 160 divisors (see below), whose sum is σ = 3890750976. Its totient is φ = 316514304.

The previous prime is 1211905943. The next prime is 1211905993. The reversal of 1211905968 is 8695091121.

It is an interprime number because it is at equal distance from previous prime (1211905943) and next prime (1211905993).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 466080 + ... + 468672.

Almost surely, 2^1211905968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211905968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1945375488).

1211905968 is an abundant number, since it is smaller than the sum of its proper divisors (2678845008).

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

1211905968 is a wasteful number, since it uses less digits than its factorization.

1211905968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731 (or 2725 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 42.

The square root of 1211905968 is about 34812.4398455495. The cubic root of 1211905968 is about 1066.1614484188.

The spelling of 1211905968 in words is "one billion, two hundred eleven million, nine hundred five thousand, nine hundred sixty-eight".