1213404400240 has 40 divisors (see below), whose sum is σ = 2897412946560. Its totient is φ = 472243873536.

The previous prime is 1213404400199. The next prime is 1213404400319. The reversal of 1213404400240 is 420044043121.

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

It is a super-2 number, since 2×1213404400240² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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, 204964000 + ... + 204969919.

It is an arithmetic number, because the mean of its divisors is an integer number (72435323664).

Almost surely, 2^{1213404400240} is an apocalyptic number.

1213404400240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213404400240 is an abundant number, since it is smaller than the sum of its proper divisors (1684008546320).

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

1213404400240 is a wasteful number, since it uses less digits than its factorization.

1213404400240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409933969 (or 409933963 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 1213404400240 its reverse (420044043121), we get a palindrome (1633448443361).

The spelling of 1213404400240 in words is "one trillion, two hundred thirteen billion, four hundred four million, four hundred thousand, two hundred forty".