7400018 has 4 divisors (see below), whose sum is σ = 11100030. Its totient is φ = 3700008.

The previous prime is 7400011. The next prime is 7400021. The reversal of 7400018 is 8100047.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8100047 = 1979 ⋅4093.

It can be written as a sum of positive squares in only one way, i.e., 6620329 + 779689 = 2573^2 + 883^2 .

It is not an unprimeable number, because it can be changed into a prime (7400011) 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, 1850003 + ... + 1850006.

Almost surely, 2^7400018 is an apocalyptic number.

7400018 is a deficient number, since it is larger than the sum of its proper divisors (3700012).

7400018 is a wasteful number, since it uses less digits than its factorization.

7400018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3700011.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 7400018 is about 2720.2974102109. The cubic root of 7400018 is about 194.8696740396.

The spelling of 7400018 in words is "seven million, four hundred thousand, eighteen".