16428949 has 4 divisors (see below), whose sum is σ = 16438464. Its totient is φ = 16419436.

The previous prime is 16428943. The next prime is 16428961. The reversal of 16428949 is 94982461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16428949 - 2³ = 16428941 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 (16428941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1357 + ... + 5890.

It is an arithmetic number, because the mean of its divisors is an integer number (4109616).

Almost surely, 2^16428949 is an apocalyptic number.

It is an amenable number.

16428949 is a deficient number, since it is larger than the sum of its proper divisors (9515).

16428949 is an equidigital number, since it uses as much as digits as its factorization.

16428949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9514.

The product of its digits is 124416, while the sum is 43.

The square root of 16428949 is about 4053.2639933762. The cubic root of 16428949 is about 254.2162221509.

The spelling of 16428949 in words is "sixteen million, four hundred twenty-eight thousand, nine hundred forty-nine".