18420737 has 8 divisors (see below), whose sum is σ = 18755712. Its totient is φ = 18088000.

The previous prime is 18420691. The next prime is 18420739. The reversal of 18420737 is 73702481.

It is a happy number.

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 18420737 - 2¹² = 18416641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18420739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28148 + ... + 28794.

It is an arithmetic number, because the mean of its divisors is an integer number (2344464).

Almost surely, 2^18420737 is an apocalyptic number.

It is an amenable number.

18420737 is a deficient number, since it is larger than the sum of its proper divisors (334975).

18420737 is an equidigital number, since it uses as much as digits as its factorization.

18420737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 18420737 is about 4291.9386062711. The cubic root of 18420737 is about 264.1003645410.

The spelling of 18420737 in words is "eighteen million, four hundred twenty thousand, seven hundred thirty-seven".