16243949 has 4 divisors (see below), whose sum is σ = 16486464. Its totient is φ = 16001436.

The previous prime is 16243937. The next prime is 16243961. The reversal of 16243949 is 94934261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94934261 = 179 ⋅530359.

It is an interprime number because it is at equal distance from previous prime (16243937) and next prime (16243961).

It is a cyclic number.

It is not a de Polignac number, because 16243949 - 2⁴ = 16243933 is a prime.

It is a super-2 number, since 2×16243949² = 527731758229202, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16243919) 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, 121157 + ... + 121290.

It is an arithmetic number, because the mean of its divisors is an integer number (4121616).

Almost surely, 2^16243949 is an apocalyptic number.

It is an amenable number.

16243949 is a deficient number, since it is larger than the sum of its proper divisors (242515).

16243949 is an equidigital number, since it uses as much as digits as its factorization.

16243949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242514.

The product of its digits is 46656, while the sum is 38.

The square root of 16243949 is about 4030.3782700883. The cubic root of 16243949 is about 253.2584079363.

The spelling of 16243949 in words is "sixteen million, two hundred forty-three thousand, nine hundred forty-nine".