1220001990 has 16 divisors (see below), whose sum is σ = 2928004848. Its totient is φ = 325333856.

The previous prime is 1220001973. The next prime is 1220002019. The reversal of 1220001990 is 991000221.

It is a self number, because there is not a number n which added to its sum of digits gives 1220001990.

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, 20333337 + ... + 20333396.

It is an arithmetic number, because the mean of its divisors is an integer number (183000303).

Almost surely, 2^1220001990 is an apocalyptic number.

1220001990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220001990 is an abundant number, since it is smaller than the sum of its proper divisors (1708002858).

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

1220001990 is a wasteful number, since it uses less digits than its factorization.

1220001990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40666743.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1220001990 is about 34928.5268799015. The cubic root of 1220001990 is about 1068.5303111251.

The spelling of 1220001990 in words is "one billion, two hundred twenty million, one thousand, nine hundred ninety".