18745406 has 4 divisors (see below), whose sum is σ = 28118112. Its totient is φ = 9372702.

The previous prime is 18745403. The next prime is 18745409. The reversal of 18745406 is 60454781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60454781 = 37 ⋅1633913.

It is an interprime number because it is at equal distance from previous prime (18745403) and next prime (18745409).

It is a super-2 number, since 2×18745406² = 702780492209672, 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 (18745403) by changing a digit.

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 as a sum of consecutive naturals, namely, 4686350 + ... + 4686353.

It is an arithmetic number, because the mean of its divisors is an integer number (7029528).

Almost surely, 2^18745406 is an apocalyptic number.

18745406 is a deficient number, since it is larger than the sum of its proper divisors (9372706).

18745406 is an equidigital number, since it uses as much as digits as its factorization.

18745406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9372705.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 18745406 is about 4329.5965169979. The cubic root of 18745406 is about 265.6429433969.

The spelling of 18745406 in words is "eighteen million, seven hundred forty-five thousand, four hundred six".