71397240 has 32 divisors (see below), whose sum is σ = 214192080. Its totient is φ = 19039232.

The previous prime is 71397233. The next prime is 71397251. The reversal of 71397240 is 4279317.

It is a congruent number.

It is an unprimeable number.

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, 297369 + ... + 297608.

Almost surely, 2^71397240 is an apocalyptic number.

It is an amenable number.

71397240 is an abundant number, since it is smaller than the sum of its proper divisors (142794840).

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

71397240 is a wasteful number, since it uses less digits than its factorization.

71397240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594991 (or 594987 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 71397240 is about 8449.6887516642. The cubic root of 71397240 is about 414.8525919590.

The spelling of 71397240 in words is "seventy-one million, three hundred ninety-seven thousand, two hundred forty".