1220215240 has 32 divisors (see below), whose sum is σ = 2746973880. Its totient is φ = 487821312.

The previous prime is 1220215219. The next prime is 1220215261. The reversal of 1220215240 is 425120221.

It is an interprime number because it is at equal distance from previous prime (1220215219) and next prime (1220215261).

It can be written as a sum of positive squares in 4 ways, for example, as 542237796 + 677977444 = 23286^2 + 26038^2 .

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, 77302 + ... + 91738.

Almost surely, 2^1220215240 is an apocalyptic number.

1220215240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220215240 is an abundant number, since it is smaller than the sum of its proper divisors (1526758640).

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

1220215240 is a wasteful number, since it uses less digits than its factorization.

1220215240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16561 (or 16557 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 1220215240 is about 34931.5794088959. The cubic root of 1220215240 is about 1068.5925653442.

Adding to 1220215240 its reverse (425120221), we get a palindrome (1645335461).

The spelling of 1220215240 in words is "one billion, two hundred twenty million, two hundred fifteen thousand, two hundred forty".