16425989 has 4 divisors (see below), whose sum is σ = 16478124. Its totient is φ = 16373856.

The previous prime is 16425971. The next prime is 16425991. The reversal of 16425989 is 98952461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3045025 + 13380964 = 1745^2 + 3658^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16425989 is a prime.

It is a super-2 number, since 2×16425989² = 539626229256242, 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 (16425089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25592 + ... + 26225.

It is an arithmetic number, because the mean of its divisors is an integer number (4119531).

Almost surely, 2^16425989 is an apocalyptic number.

It is an amenable number.

16425989 is a deficient number, since it is larger than the sum of its proper divisors (52135).

16425989 is an equidigital number, since it uses as much as digits as its factorization.

16425989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52134.

The product of its digits is 155520, while the sum is 44.

The square root of 16425989 is about 4052.8988391027. The cubic root of 16425989 is about 254.2009538742.

The spelling of 16425989 in words is "sixteen million, four hundred twenty-five thousand, nine hundred eighty-nine".