16990049 has 4 divisors (see below), whose sum is σ = 16998420. Its totient is φ = 16981680.

The previous prime is 16990037. The next prime is 16990081. The reversal of 16990049 is 94009961.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11607649 + 5382400 = 3407^2 + 2320^2 .

It is a cyclic number.

It is not a de Polignac number, because 16990049 - 2⁴ = 16990033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16989994 and 16990021.

It is not an unprimeable number, because it can be changed into a prime (16990019) 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, 1007 + ... + 5915.

It is an arithmetic number, because the mean of its divisors is an integer number (4249605).

Almost surely, 2^16990049 is an apocalyptic number.

It is an amenable number.

16990049 is a deficient number, since it is larger than the sum of its proper divisors (8371).

16990049 is an equidigital number, since it uses as much as digits as its factorization.

16990049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8370.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 16990049 is about 4121.8987129720. The cubic root of 16990049 is about 257.0779790321.

The spelling of 16990049 in words is "sixteen million, nine hundred ninety thousand, forty-nine".