1213420240 has 40 divisors (see below), whose sum is σ = 2840164200. Its totient is φ = 482105856.

The previous prime is 1213420231. The next prime is 1213420267. The reversal of 1213420240 is 420243121.

It can be written as a sum of positive squares in 4 ways, for example, as 256384144 + 957036096 = 16012^2 + 30936^2 .

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

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, 38979 + ... + 62818.

It is an arithmetic number, because the mean of its divisors is an integer number (71004105).

Almost surely, 2^1213420240 is an apocalyptic number.

1213420240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213420240 is an abundant number, since it is smaller than the sum of its proper divisors (1626743960).

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

1213420240 is a wasteful number, since it uses less digits than its factorization.

1213420240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101959 (or 101953 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1213420240 is about 34834.1820630254. The cubic root of 1213420240 is about 1066.6053185203.

Adding to 1213420240 its reverse (420243121), we get a palindrome (1633663361).

The spelling of 1213420240 in words is "one billion, two hundred thirteen million, four hundred twenty thousand, two hundred forty".