18406955 has 8 divisors (see below), whose sum is σ = 25243872. Its totient is φ = 12621888.

The previous prime is 18406951. The next prime is 18406979. The reversal of 18406955 is 55960481.

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

It is a cyclic number.

It is not a de Polignac number, because 18406955 - 2² = 18406951 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18406951) 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 7 ways as a sum of consecutive naturals, for example, 262922 + ... + 262991.

It is an arithmetic number, because the mean of its divisors is an integer number (3155484).

Almost surely, 2^18406955 is an apocalyptic number.

18406955 is a deficient number, since it is larger than the sum of its proper divisors (6836917).

18406955 is an equidigital number, since it uses as much as digits as its factorization.

18406955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525925.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 18406955 is about 4290.3327376790. The cubic root of 18406955 is about 264.0344833668.

The spelling of 18406955 in words is "eighteen million, four hundred six thousand, nine hundred fifty-five".