1211957360 has 40 divisors (see below), whose sum is σ = 2870976960. Its totient is φ = 475634432.

The previous prime is 1211957339. The next prime is 1211957363. The reversal of 1211957360 is 637591121.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 1211957360.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211957363) 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, 138680 + ... + 147159.

It is an arithmetic number, because the mean of its divisors is an integer number (71774424).

Almost surely, 2^1211957360 is an apocalyptic number.

1211957360 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211957360 is an abundant number, since it is smaller than the sum of its proper divisors (1659019600).

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

1211957360 is a wasteful number, since it uses less digits than its factorization.

1211957360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285905 (or 285899 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 1211957360 is about 34813.1779646731. The cubic root of 1211957360 is about 1066.1765187284.

The spelling of 1211957360 in words is "one billion, two hundred eleven million, nine hundred fifty-seven thousand, three hundred sixty".