1213400740 has 24 divisors (see below), whose sum is σ = 2610293112. Its totient is φ = 473521920.

The previous prime is 1213400717. The next prime is 1213400767. The reversal of 1213400740 is 470043121.

It can be written as a sum of positive squares in 4 ways, for example, as 12916836 + 1200483904 = 3594^2 + 34648^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 739059 + ... + 740698.

It is an arithmetic number, because the mean of its divisors is an integer number (108762213).

Almost surely, 2^1213400740 is an apocalyptic number.

1213400740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213400740 is an abundant number, since it is smaller than the sum of its proper divisors (1396892372).

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

1213400740 is a wasteful number, since it uses less digits than its factorization.

1213400740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479807 (or 1479805 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 1213400740 is about 34833.9021644145. The cubic root of 1213400740 is about 1066.5996049419.

Adding to 1213400740 its reverse (470043121), we get a palindrome (1683443861).

The spelling of 1213400740 in words is "one billion, two hundred thirteen million, four hundred thousand, seven hundred forty".