7018381 has 4 divisors (see below), whose sum is σ = 7323552. Its totient is φ = 6713212.

The previous prime is 7018379. The next prime is 7018387. The reversal of 7018381 is 1838107.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7018381 - 2¹ = 7018379 is a prime.

It is a super-2 number, since 2×7018381² = 98515343722322, which contains 22 as substring.

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

It is a Duffinian number.

7018381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7018387) 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 3 ways as a sum of consecutive naturals, for example, 152551 + ... + 152596.

It is an arithmetic number, because the mean of its divisors is an integer number (1830888).

Almost surely, 2^7018381 is an apocalyptic number.

It is an amenable number.

7018381 is a deficient number, since it is larger than the sum of its proper divisors (305171).

7018381 is a wasteful number, since it uses less digits than its factorization.

7018381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305170.

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

The square root of 7018381 is about 2649.2227161943. Note that the first 3 decimals coincide. The cubic root of 7018381 is about 191.4604080699.

The spelling of 7018381 in words is "seven million, eighteen thousand, three hundred eighty-one".