71940018 has 16 divisors (see below), whose sum is σ = 144075456. Its totient is φ = 23947440.

The previous prime is 71940017. The next prime is 71940019. The reversal of 71940018 is 81004917.

It is an interprime number because it is at equal distance from previous prime (71940017) and next prime (71940019).

It is not an unprimeable number, because it can be changed into a prime (71940013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3118 + ... + 12393.

It is an arithmetic number, because the mean of its divisors is an integer number (9004716).

Almost surely, 2^71940018 is an apocalyptic number.

71940018 is an abundant number, since it is smaller than the sum of its proper divisors (72135438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71940018 is a wasteful number, since it uses less digits than its factorization.

71940018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16289.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 71940018 is about 8481.7461645583. The cubic root of 71940018 is about 415.9012069704.

The spelling of 71940018 in words is "seventy-one million, nine hundred forty thousand, eighteen".