71171940 has 48 divisors (see below), whose sum is σ = 227751552. Its totient is φ = 16267776.

The previous prime is 71171927. The next prime is 71171981. The reversal of 71171940 is 4917117.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 71171898 and 71171907.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84309 + ... + 85148.

It is an arithmetic number, because the mean of its divisors is an integer number (4744824).

Almost surely, 2^71171940 is an apocalyptic number.

71171940 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71171940 is an abundant number, since it is smaller than the sum of its proper divisors (156579612).

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

71171940 is a wasteful number, since it uses less digits than its factorization.

71171940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169476 (or 169474 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 30.

The square root of 71171940 is about 8436.3463655779. The cubic root of 71171940 is about 414.4157647312.

The spelling of 71171940 in words is "seventy-one million, one hundred seventy-one thousand, nine hundred forty".