1220001993 has 60 divisors (see below), whose sum is σ = 2153141760. Its totient is φ = 674354160.

The previous prime is 1220001973. The next prime is 1220002019. The reversal of 1220001993 is 3991000221.

It is not a de Polignac number, because 1220001993 - 2⁶ = 1220001929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1220001973) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 543768 + ... + 546006.

It is an arithmetic number, because the mean of its divisors is an integer number (35885696).

Almost surely, 2^1220001993 is an apocalyptic number.

It is an amenable number.

1220001993 is a deficient number, since it is larger than the sum of its proper divisors (933139767).

1220001993 is an equidigital number, since it uses as much as digits as its factorization.

1220001993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320 (or 2280 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 1220001993 is about 34928.5269228463. The cubic root of 1220001993 is about 1068.5303120010.

The spelling of 1220001993 in words is "one billion, two hundred twenty million, one thousand, nine hundred ninety-three".