18781036 has 6 divisors (see below), whose sum is σ = 32866820. Its totient is φ = 9390516.

The previous prime is 18781033. The next prime is 18781069. The reversal of 18781036 is 63018781.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 18780992 and 18781010.

It is not an unprimeable number, because it can be changed into a prime (18781033) 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 as a sum of consecutive naturals, namely, 2347626 + ... + 2347633.

Almost surely, 2^18781036 is an apocalyptic number.

It is an amenable number.

18781036 is a deficient number, since it is larger than the sum of its proper divisors (14085784).

18781036 is a wasteful number, since it uses less digits than its factorization.

18781036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4695263 (or 4695261 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 18781036 is about 4333.7092657445. The cubic root of 18781036 is about 265.8111422554.

The spelling of 18781036 in words is "eighteen million, seven hundred eighty-one thousand, thirty-six".