1642968989 has 8 divisors (see below), whose sum is σ = 1680666240. Its totient is φ = 1605386016.

The previous prime is 1642968967. The next prime is 1642968991. The reversal of 1642968989 is 9898692461.

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 1642968989 - 2¹² = 1642964893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642968949) 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, 857 + ... + 57329.

It is an arithmetic number, because the mean of its divisors is an integer number (210083280).

Almost surely, 2^1642968989 is an apocalyptic number.

It is an amenable number.

1642968989 is a deficient number, since it is larger than the sum of its proper divisors (37697251).

1642968989 is an equidigital number, since it uses as much as digits as its factorization.

1642968989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57139.

The product of its digits is 13436928, while the sum is 62.

The square root of 1642968989 is about 40533.5538659023. The cubic root of 1642968989 is about 1179.9849153008.

The spelling of 1642968989 in words is "one billion, six hundred forty-two million, nine hundred sixty-eight thousand, nine hundred eighty-nine".