16402649 has 8 divisors (see below), whose sum is σ = 16787520. Its totient is φ = 16021456.

The previous prime is 16402621. The next prime is 16402667. The reversal of 16402649 is 94620461.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 16402649 - 2¹² = 16398553 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (16402609) 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 7 ways as a sum of consecutive naturals, for example, 9404 + ... + 11010.

It is an arithmetic number, because the mean of its divisors is an integer number (2098440).

Almost surely, 2^16402649 is an apocalyptic number.

It is an amenable number.

16402649 is a deficient number, since it is larger than the sum of its proper divisors (384871).

16402649 is a wasteful number, since it uses less digits than its factorization.

16402649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 16402649 is about 4050.0183950200. The cubic root of 16402649 is about 254.0804971474.

The spelling of 16402649 in words is "sixteen million, four hundred two thousand, six hundred forty-nine".