1213611240 has 64 divisors (see below), whose sum is σ = 3643133760. Its totient is φ = 323425280.

The previous prime is 1213611239. The next prime is 1213611277. The reversal of 1213611240 is 421163121.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345895 + ... + 349385.

It is an arithmetic number, because the mean of its divisors is an integer number (56923965).

Almost surely, 2^1213611240 is an apocalyptic number.

1213611240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213611240 is an abundant number, since it is smaller than the sum of its proper divisors (2429522520).

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

1213611240 is a wasteful number, since it uses less digits than its factorization.

1213611240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6402 (or 6398 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1213611240 is about 34836.9235151441. The cubic root of 1213611240 is about 1066.6612790526.

Adding to 1213611240 its reverse (421163121), we get a palindrome (1634774361).

The spelling of 1213611240 in words is "one billion, two hundred thirteen million, six hundred eleven thousand, two hundred forty".