18269949 has 4 divisors (see below), whose sum is σ = 24359936. Its totient is φ = 12179964.

The previous prime is 18269947. The next prime is 18269957. The reversal of 18269949 is 94996281.

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.

It is not a de Polignac number, because 18269949 - 2¹ = 18269947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18269898 and 18269907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18269941) 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, 3044989 + ... + 3044994.

It is an arithmetic number, because the mean of its divisors is an integer number (6089984).

Almost surely, 2^18269949 is an apocalyptic number.

It is an amenable number.

18269949 is a deficient number, since it is larger than the sum of its proper divisors (6089987).

18269949 is an equidigital number, since it uses as much as digits as its factorization.

18269949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6089986.

The product of its digits is 279936, while the sum is 48.

The square root of 18269949 is about 4274.3360887979. The cubic root of 18269949 is about 263.3777672532.

The spelling of 18269949 in words is "eighteen million, two hundred sixty-nine thousand, nine hundred forty-nine".