1220399700 has 108 divisors (see below), whose sum is σ = 3823692768. Its totient is φ = 300393600.

The previous prime is 1220399681. The next prime is 1220399701. The reversal of 1220399700 is 79930221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220399701) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 38665 + ... + 62735.

Almost surely, 2^1220399700 is an apocalyptic number.

1220399700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220399700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1911846384).

1220399700 is an abundant number, since it is smaller than the sum of its proper divisors (2603293068).

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

1220399700 is a wasteful number, since it uses less digits than its factorization.

1220399700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24114 (or 24094 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 1220399700 is about 34934.2196134392. The cubic root of 1220399700 is about 1068.6464090287.

The spelling of 1220399700 in words is "one billion, two hundred twenty million, three hundred ninety-nine thousand, seven hundred".