16443745 has 8 divisors (see below), whose sum is σ = 19754280. Its totient is φ = 13140480.

The previous prime is 16443737. The next prime is 16443767. The reversal of 16443745 is 54734461.

It can be written as a sum of positive squares in 4 ways, for example, as 65536 + 16378209 = 256^2 + 4047^2 .

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

It is not a de Polignac number, because 16443745 - 2³ = 16443737 is a prime.

It is a super-3 number, since 3×16443745³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16443745.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7761 + ... + 9649.

It is an arithmetic number, because the mean of its divisors is an integer number (2469285).

Almost surely, 2^16443745 is an apocalyptic number.

It is an amenable number.

16443745 is a deficient number, since it is larger than the sum of its proper divisors (3310535).

16443745 is a wasteful number, since it uses less digits than its factorization.

16443745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3635.

The product of its digits is 40320, while the sum is 34.

The square root of 16443745 is about 4055.0887783130. The cubic root of 16443745 is about 254.2925154186.

The spelling of 16443745 in words is "sixteen million, four hundred forty-three thousand, seven hundred forty-five".