16428749 has 12 divisors (see below), whose sum is σ = 18365724. Its totient is φ = 14643072.

The previous prime is 16428743. The next prime is 16428751. The reversal of 16428749 is 94782461.

It can be written as a sum of positive squares in 2 ways, for example, as 5373124 + 11055625 = 2318^2 + 3325^2 .

It is not a de Polignac number, because 16428749 - 2⁸ = 16428493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16428743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4799 + ... + 7475.

It is an arithmetic number, because the mean of its divisors is an integer number (1530477).

Almost surely, 2^16428749 is an apocalyptic number.

16428749 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16428749 is a deficient number, since it is larger than the sum of its proper divisors (1936975).

16428749 is a wasteful number, since it uses less digits than its factorization.

16428749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732 (or 2713 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 16428749 is about 4053.2393218264. The cubic root of 16428749 is about 254.2151905683.

The spelling of 16428749 in words is "sixteen million, four hundred twenty-eight thousand, seven hundred forty-nine".