18499481 has 16 divisors (see below), whose sum is σ = 24839808. Its totient is φ = 13305600.

The previous prime is 18499447. The next prime is 18499489.

18499481 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-18499481 is a prime.

It is a super-2 number, since 2×18499481² = 684461594538722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18499489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8240 + ... + 10241.

It is an arithmetic number, because the mean of its divisors is an integer number (1552488).

Almost surely, 2^18499481 is an apocalyptic number.

18499481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18499481 is a deficient number, since it is larger than the sum of its proper divisors (6340327).

18499481 is a wasteful number, since it uses less digits than its factorization.

18499481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18512.

The product of its digits is 82944, while the sum is 44.

The square root of 18499481 is about 4301.1023005737. The cubic root of 18499481 is about 264.4761503790.

The spelling of 18499481 in words is "eighteen million, four hundred ninety-nine thousand, four hundred eighty-one".