16173949 has 6 divisors (see below), whose sum is σ = 17778110. Its totient is φ = 14703480.

The previous prime is 16173929. The next prime is 16173973. The reversal of 16173949 is 94937161.

It can be written as a sum of positive squares in only one way, i.e., 8305924 + 7868025 = 2882^2 + 2805^2 .

It is not a de Polignac number, because 16173949 - 2⁵ = 16173917 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 (16173929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66714 + ... + 66955.

Almost surely, 2^16173949 is an apocalyptic number.

It is an amenable number.

16173949 is a deficient number, since it is larger than the sum of its proper divisors (1604161).

16173949 is a wasteful number, since it uses less digits than its factorization.

16173949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133691 (or 133680 counting only the distinct ones).

The product of its digits is 40824, while the sum is 40.

The square root of 16173949 is about 4021.6848459321. The cubic root of 16173949 is about 252.8940955617.

The spelling of 16173949 in words is "sixteen million, one hundred seventy-three thousand, nine hundred forty-nine".