18070381 has 16 divisors (see below), whose sum is σ = 21450240. Its totient is φ = 14901120.

The previous prime is 18070379. The next prime is 18070391. The reversal of 18070381 is 18307081.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18070381 - 2¹ = 18070379 is a prime.

It is a super-2 number, since 2×18070381² = 653077338970322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18070301) 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, 22275 + ... + 23071.

It is an arithmetic number, because the mean of its divisors is an integer number (1340640).

Almost surely, 2^18070381 is an apocalyptic number.

It is an amenable number.

18070381 is a deficient number, since it is larger than the sum of its proper divisors (3379859).

18070381 is an equidigital number, since it uses as much as digits as its factorization.

18070381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 18070381 is about 4250.9270753566. The cubic root of 18070381 is about 262.4152700082.

The spelling of 18070381 in words is "eighteen million, seventy thousand, three hundred eighty-one".