18477481 has 16 divisors (see below), whose sum is σ = 21369600. Its totient is φ = 15800400.

The previous prime is 18477469. The next prime is 18477491.

18477481 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18477481 - 2¹⁹ = 17953193 is a prime.

It is a super-2 number, since 2×18477481² = 682834608210722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18477491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43890 + ... + 44308.

It is an arithmetic number, because the mean of its divisors is an integer number (1335600).

Almost surely, 2^18477481 is an apocalyptic number.

18477481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18477481 is a deficient number, since it is larger than the sum of its proper divisors (2892119).

18477481 is a wasteful number, since it uses less digits than its factorization.

18477481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660.

The product of its digits is 50176, while the sum is 40.

The square root of 18477481 is about 4298.5440558403. The cubic root of 18477481 is about 264.3712684579.

The spelling of 18477481 in words is "eighteen million, four hundred seventy-seven thousand, four hundred eighty-one".