71421426 has 40 divisors (see below), whose sum is σ = 163955484. Its totient is φ = 23224320.

The previous prime is 71421419. The next prime is 71421439. The reversal of 71421426 is 62412417.

It can be written as a sum of positive squares in 2 ways, for example, as 71419401 + 2025 = 8451^2 + 45^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 71421426.

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 19 ways as a sum of consecutive naturals, for example, 1266 + ... + 12018.

Almost surely, 2^71421426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71421426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81977742).

71421426 is an abundant number, since it is smaller than the sum of its proper divisors (92534058).

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

71421426 is a wasteful number, since it uses less digits than its factorization.

71421426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10808 (or 10799 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 71421426 is about 8451.1198074575. The cubic root of 71421426 is about 414.8994308006.

Subtracting from 71421426 its reverse (62412417), we obtain a palindrome (9009009).

The spelling of 71421426 in words is "seventy-one million, four hundred twenty-one thousand, four hundred twenty-six".