18081407 has 6 divisors (see below), whose sum is σ = 19083528. Its totient is φ = 17129412.

The previous prime is 18081389. The next prime is 18081409. The reversal of 18081407 is 70418081.

It is not a de Polignac number, because 18081407 - 2¹⁴ = 18065023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18081407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18081409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24683 + ... + 25404.

It is an arithmetic number, because the mean of its divisors is an integer number (3180588).

Almost surely, 2^18081407 is an apocalyptic number.

18081407 is a deficient number, since it is larger than the sum of its proper divisors (1002121).

18081407 is an equidigital number, since it uses as much as digits as its factorization.

18081407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50125 (or 50106 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 18081407 is about 4252.2237711579. The cubic root of 18081407 is about 262.4686317770.

Adding to 18081407 its reverse (70418081), we get a palindrome (88499488).

The spelling of 18081407 in words is "eighteen million, eighty-one thousand, four hundred seven".