71421930 has 48 divisors (see below), whose sum is σ = 196624584. Its totient is φ = 17925120.

The previous prime is 71421929. The next prime is 71421937. The reversal of 71421930 is 3912417.

It can be written as a sum of positive squares in 4 ways, for example, as 71216721 + 205209 = 8439^2 + 453^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 71421894 and 71421903.

It is not an unprimeable number, because it can be changed into a prime (71421937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21811 + ... + 24870.

Almost surely, 2^71421930 is an apocalyptic number.

71421930 is an abundant number, since it is smaller than the sum of its proper divisors (125202654).

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

71421930 is a wasteful number, since it uses less digits than its factorization.

71421930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46711 (or 46708 counting only the distinct ones).

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

The square root of 71421930 is about 8451.1496259385. The cubic root of 71421930 is about 414.9004067394.

The spelling of 71421930 in words is "seventy-one million, four hundred twenty-one thousand, nine hundred thirty".