16398890 has 8 divisors (see below), whose sum is σ = 29518020. Its totient is φ = 6559552.

The previous prime is 16398887. The next prime is 16398947. The reversal of 16398890 is 9889361.

It can be written as a sum of positive squares in 2 ways, for example, as 16394401 + 4489 = 4049^2 + 67^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 819935 + ... + 819954.

Almost surely, 2^16398890 is an apocalyptic number.

16398890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16398890 is a deficient number, since it is larger than the sum of its proper divisors (13119130).

16398890 is a wasteful number, since it uses less digits than its factorization.

16398890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639896.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 16398890 is about 4049.5542964628. The cubic root of 16398890 is about 254.0610864299.

The spelling of 16398890 in words is "sixteen million, three hundred ninety-eight thousand, eight hundred ninety".