18949536 has 72 divisors (see below), whose sum is σ = 56740320. Its totient is φ = 5982336.

The previous prime is 18949531. The next prime is 18949537. The reversal of 18949536 is 63594981.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 18949491 and 18949500.

It is not an unprimeable number, because it can be changed into a prime (18949531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3741 + ... + 7203.

It is an arithmetic number, because the mean of its divisors is an integer number (788060).

Almost surely, 2^18949536 is an apocalyptic number.

18949536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18949536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28370160).

18949536 is an abundant number, since it is smaller than the sum of its proper divisors (37790784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18949536 is a wasteful number, since it uses less digits than its factorization.

18949536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498 (or 3487 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 18949536 is about 4353.1064769886. The cubic root of 18949536 is about 266.6037129170.

The spelling of 18949536 in words is "eighteen million, nine hundred forty-nine thousand, five hundred thirty-six".