16398945 has 24 divisors (see below), whose sum is σ = 28530216. Its totient is φ = 8713728.

The previous prime is 16398887. The next prime is 16398947. The reversal of 16398945 is 54989361.

It is a happy number.

16398945 is a `hidden beast` number, since 1 + 639 + 8 + 9 + 4 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5349969 + 11048976 = 2313^2 + 3324^2 .

It is not a de Polignac number, because 16398945 - 2⁹ = 16398433 is a prime.

It is a super-2 number, since 2×16398945² = 537850794226050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 16398945.

It is not an unprimeable number, because it can be changed into a prime (16398947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16297 + ... + 17273.

It is an arithmetic number, because the mean of its divisors is an integer number (1188759).

Almost surely, 2^16398945 is an apocalyptic number.

16398945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16398945 is a deficient number, since it is larger than the sum of its proper divisors (12131271).

16398945 is a wasteful number, since it uses less digits than its factorization.

16398945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361 (or 1358 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 16398945 is about 4049.5610873279. The cubic root of 16398945 is about 254.0613704602.

The spelling of 16398945 in words is "sixteen million, three hundred ninety-eight thousand, nine hundred forty-five".