1220420240 has 40 divisors (see below), whose sum is σ = 3055747128. Its totient is φ = 450616320.

The previous prime is 1220420233. The next prime is 1220420261. The reversal of 1220420240 is 420240221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 22429696 + 1197990544 = 4736^2 + 34612^2 .

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

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, 585701 + ... + 587780.

Almost surely, 2^1220420240 is an apocalyptic number.

1220420240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220420240 is an abundant number, since it is smaller than the sum of its proper divisors (1835326888).

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

1220420240 is a wasteful number, since it uses less digits than its factorization.

1220420240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173507 (or 1173501 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 1220420240 is about 34934.5135932934. The cubic root of 1220420240 is about 1068.6524042978.

Adding to 1220420240 its reverse (420240221), we get a palindrome (1640660461).

The spelling of 1220420240 in words is "one billion, two hundred twenty million, four hundred twenty thousand, two hundred forty".