18263949 has 32 divisors (see below), whose sum is σ = 27760128. Its totient is φ = 10584000.

The previous prime is 18263911. The next prime is 18263951. The reversal of 18263949 is 94936281.

It is not a de Polignac number, because 18263949 - 2¹⁵ = 18231181 is a prime.

It is a super-3 number, since 3×18263949³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18263949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18263989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86454 + ... + 86664.

It is an arithmetic number, because the mean of its divisors is an integer number (867504).

Almost surely, 2^18263949 is an apocalyptic number.

It is an amenable number.

18263949 is a deficient number, since it is larger than the sum of its proper divisors (9496179).

18263949 is a wasteful number, since it uses less digits than its factorization.

18263949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329.

The product of its digits is 93312, while the sum is 42.

The square root of 18263949 is about 4273.6341677781. The cubic root of 18263949 is about 263.3489322953.

It can be divided in two parts, 1826 and 3949, that added together give a palindrome (5775).

The spelling of 18263949 in words is "eighteen million, two hundred sixty-three thousand, nine hundred forty-nine".