16213949 has 4 divisors (see below), whose sum is σ = 16228860. Its totient is φ = 16199040.

The previous prime is 16213943. The next prime is 16213969. The reversal of 16213949 is 94931261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94931261 = 109 ⋅870929.

It can be written as a sum of positive squares in 2 ways, for example, as 10956100 + 5257849 = 3310^2 + 2293^2 .

It is a cyclic number.

It is not a de Polignac number, because 16213949 - 2¹⁶ = 16148413 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 (16213943) 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, 5684 + ... + 8045.

It is an arithmetic number, because the mean of its divisors is an integer number (4057215).

Almost surely, 2^16213949 is an apocalyptic number.

It is an amenable number.

16213949 is a deficient number, since it is larger than the sum of its proper divisors (14911).

16213949 is a wasteful number, since it uses less digits than its factorization.

16213949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14910.

The product of its digits is 11664, while the sum is 35.

The square root of 16213949 is about 4026.6548151040. The cubic root of 16213949 is about 253.1024024739.

The spelling of 16213949 in words is "sixteen million, two hundred thirteen thousand, nine hundred forty-nine".