1220001989 has 8 divisors (see below), whose sum is σ = 1284744000. Its totient is φ = 1155313152.

The previous prime is 1220001973. The next prime is 1220002019. The reversal of 1220001989 is 9891000221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220001989 - 2⁴ = 1220001973 is a prime.

It is a super-2 number, since 2×1220001989² = 2976809706327912242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220001929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39152 + ... + 63030.

It is an arithmetic number, because the mean of its divisors is an integer number (160593000).

Almost surely, 2^1220001989 is an apocalyptic number.

1220001989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1220001989 is a deficient number, since it is larger than the sum of its proper divisors (64742011).

1220001989 is a wasteful number, since it uses less digits than its factorization.

1220001989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26587.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1220001989 is about 34928.5268655865. The cubic root of 1220001989 is about 1068.5303108332.

The spelling of 1220001989 in words is "one billion, two hundred twenty million, one thousand, nine hundred eighty-nine".