16445389 has 2 divisors, whose sum is σ = 16445390. Its totient is φ = 16445388.

The previous prime is 16445383. The next prime is 16445399. The reversal of 16445389 is 98354461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15342889 + 1102500 = 3917^2 + 1050^2 .

It is a cyclic number.

It is not a de Polignac number, because 16445389 - 2³ = 16445381 is a prime.

It is a super-2 number, since 2×16445389² = 540901638722642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16445381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8222694 + 8222695.

It is an arithmetic number, because the mean of its divisors is an integer number (8222695).

Almost surely, 2^16445389 is an apocalyptic number.

It is an amenable number.

16445389 is a deficient number, since it is larger than the sum of its proper divisors (1).

16445389 is an equidigital number, since it uses as much as digits as its factorization.

16445389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 16445389 is about 4055.2914815091. The cubic root of 16445389 is about 254.3009896229.

The spelling of 16445389 in words is "sixteen million, four hundred forty-five thousand, three hundred eighty-nine".