1672391989 has 8 divisors (see below), whose sum is σ = 1769633280. Its totient is φ = 1576072800.

The previous prime is 1672391953. The next prime is 1672392019. The reversal of 1672391989 is 9891932761.

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

It is not a de Polignac number, because 1672391989 - 2⁹ = 1672391477 is a prime.

It is a super-2 number, since 2×1672391989² = 5593789929742752242, 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 (1672391909) 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, 226792 + ... + 234049.

It is an arithmetic number, because the mean of its divisors is an integer number (221204160).

Almost surely, 2^1672391989 is an apocalyptic number.

1672391989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1672391989 is a deficient number, since it is larger than the sum of its proper divisors (97241291).

1672391989 is a wasteful number, since it uses less digits than its factorization.

1672391989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461051.

The product of its digits is 1469664, while the sum is 55.

The square root of 1672391989 is about 40894.8895217972. The cubic root of 1672391989 is about 1186.9871739346.

The spelling of 1672391989 in words is "one billion, six hundred seventy-two million, three hundred ninety-one thousand, nine hundred eighty-nine".