71843140 has 48 divisors (see below), whose sum is σ = 154441728. Its totient is φ = 28066304.

The previous prime is 71843137. The next prime is 71843141. The reversal of 71843140 is 4134817.

It is a super-2 number, since 2×71843140² = 10322873530119200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71843099 and 71843108.

It is not an unprimeable number, because it can be changed into a prime (71843141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187389 + ... + 187771.

It is an arithmetic number, because the mean of its divisors is an integer number (3217536).

Almost surely, 2^71843140 is an apocalyptic number.

It is an amenable number.

71843140 is an abundant number, since it is smaller than the sum of its proper divisors (82598588).

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

71843140 is a wasteful number, since it uses less digits than its factorization.

71843140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588 (or 586 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 71843140 is about 8476.0332703453. The cubic root of 71843140 is about 415.7144320337.

Adding to 71843140 its reverse (4134817), we get a palindrome (75977957).

The spelling of 71843140 in words is "seventy-one million, eight hundred forty-three thousand, one hundred forty".