1213588240 has 40 divisors (see below), whose sum is σ = 2824551360. Its totient is φ = 484926336.

The previous prime is 1213588199. The next prime is 1213588267. The reversal of 1213588240 is 428853121.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1213588196 and 1213588205.

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, 74077 + ... + 88963.

It is an arithmetic number, because the mean of its divisors is an integer number (70613784).

Almost surely, 2^1213588240 is an apocalyptic number.

1213588240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213588240 is an abundant number, since it is smaller than the sum of its proper divisors (1610963120).

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

1213588240 is a wasteful number, since it uses less digits than its factorization.

1213588240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15919 (or 15913 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 1213588240 is about 34836.5934040629. The cubic root of 1213588240 is about 1066.6545406608.

The spelling of 1213588240 in words is "one billion, two hundred thirteen million, five hundred eighty-eight thousand, two hundred forty".