18408069 has 12 divisors (see below), whose sum is σ = 27506700. Its totient is φ = 11848704.

The previous prime is 18408053. The next prime is 18408077. The reversal of 18408069 is 96080481.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9922500 + 8485569 = 3150^2 + 2913^2 .

It is not a de Polignac number, because 18408069 - 2⁴ = 18408053 is a prime.

It is a super-2 number, since 2×18408069² = 677714008617522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18401069) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35004 + ... + 35525.

It is an arithmetic number, because the mean of its divisors is an integer number (2292225).

Almost surely, 2^18408069 is an apocalyptic number.

It is an amenable number.

18408069 is a deficient number, since it is larger than the sum of its proper divisors (9098631).

18408069 is a wasteful number, since it uses less digits than its factorization.

18408069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70564 (or 70561 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18408069 is about 4290.4625624751. The cubic root of 18408069 is about 264.0398097680.

The spelling of 18408069 in words is "eighteen million, four hundred eight thousand, sixty-nine".