1220340440 has 64 divisors (see below), whose sum is σ = 3125640960. Its totient is φ = 424462720.

The previous prime is 1220340419. The next prime is 1220340467. The reversal of 1220340440 is 440430221.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50174 + ... + 70413.

It is an arithmetic number, because the mean of its divisors is an integer number (48838140).

Almost surely, 2^1220340440 is an apocalyptic number.

1220340440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220340440 is an abundant number, since it is smaller than the sum of its proper divisors (1905300520).

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

1220340440 is a wasteful number, since it uses less digits than its factorization.

1220340440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120632 (or 120628 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1220340440 is about 34933.3714376383. The cubic root of 1220340440 is about 1068.6291116871.

Adding to 1220340440 its reverse (440430221), we get a palindrome (1660770661).

The spelling of 1220340440 in words is "one billion, two hundred twenty million, three hundred forty thousand, four hundred forty".