1320888989 has 4 divisors (see below), whose sum is σ = 1509587424. Its totient is φ = 1132190556.

The previous prime is 1320888983. The next prime is 1320888997. The reversal of 1320888989 is 9898880231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1320888989 - 2⁴ = 1320888973 is a prime.

It is a super-2 number, since 2×1320888989² = 3489495442522884242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320888983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94349207 + ... + 94349220.

It is an arithmetic number, because the mean of its divisors is an integer number (377396856).

Almost surely, 2^1320888989 is an apocalyptic number.

It is an amenable number.

1320888989 is a deficient number, since it is larger than the sum of its proper divisors (188698435).

1320888989 is an equidigital number, since it uses as much as digits as its factorization.

1320888989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188698434.

The product of its (nonzero) digits is 1990656, while the sum is 56.

The square root of 1320888989 is about 36344.0364984408. The cubic root of 1320888989 is about 1097.2075144508.

The spelling of 1320888989 in words is "one billion, three hundred twenty million, eight hundred eighty-eight thousand, nine hundred eighty-nine".