71123940 has 48 divisors (see below), whose sum is σ = 221276160. Its totient is φ = 18966240.

The previous prime is 71123891. The next prime is 71123947. The reversal of 71123940 is 4932117.

It is a super-2 number, since 2×71123940² = 10117229682247200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (71123947) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 65316 + ... + 66395.

It is an arithmetic number, because the mean of its divisors is an integer number (4609920).

Almost surely, 2^71123940 is an apocalyptic number.

It is an amenable number.

71123940 is an abundant number, since it is smaller than the sum of its proper divisors (150152220).

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

71123940 is a wasteful number, since it uses less digits than its factorization.

71123940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131729 (or 131721 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 71123940 is about 8433.5010523507. The cubic root of 71123940 is about 414.3225799253.

The spelling of 71123940 in words is "seventy-one million, one hundred twenty-three thousand, nine hundred forty".