18406534 has 8 divisors (see below), whose sum is σ = 27729000. Its totient is φ = 9163536.

The previous prime is 18406517. The next prime is 18406547. The reversal of 18406534 is 43560481.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18406496 and 18406505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19284 + ... + 20215.

It is an arithmetic number, because the mean of its divisors is an integer number (3466125).

Almost surely, 2^18406534 is an apocalyptic number.

18406534 is a deficient number, since it is larger than the sum of its proper divisors (9322466).

18406534 is a wasteful number, since it uses less digits than its factorization.

18406534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39734.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 18406534 is about 4290.2836736048. The cubic root of 18406534 is about 264.0324703710.

The spelling of 18406534 in words is "eighteen million, four hundred six thousand, five hundred thirty-four".