18726081 has 24 divisors (see below), whose sum is σ = 27834240. Its totient is φ = 11188320.

The previous prime is 18726073. The next prime is 18726101. The reversal of 18726081 is 18062781.

It is a happy number.

It is not a de Polignac number, because 18726081 - 2³ = 18726073 is a prime.

It is a super-2 number, since 2×18726081² = 701332219237122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (18726481) 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 23 ways as a sum of consecutive naturals, for example, 28351 + ... + 29003.

It is an arithmetic number, because the mean of its divisors is an integer number (1159760).

Almost surely, 2^18726081 is an apocalyptic number.

18726081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18726081 is a deficient number, since it is larger than the sum of its proper divisors (9108159).

18726081 is a wasteful number, since it uses less digits than its factorization.

18726081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757 (or 746 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 18726081 is about 4327.3642093080. The cubic root of 18726081 is about 265.5516265344.

The spelling of 18726081 in words is "eighteen million, seven hundred twenty-six thousand, eighty-one".