71398642 has 16 divisors (see below), whose sum is σ = 126346752. Its totient is φ = 29612160.

The previous prime is 71398631. The next prime is 71398643. The reversal of 71398642 is 24689317.

It is a junction number, because it is equal to n+sod(n) for n = 71398595 and 71398604.

It is not an unprimeable number, because it can be changed into a prime (71398643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81823 + ... + 82690.

It is an arithmetic number, because the mean of its divisors is an integer number (7896672).

Almost surely, 2^71398642 is an apocalyptic number.

71398642 is a deficient number, since it is larger than the sum of its proper divisors (54948110).

71398642 is a wasteful number, since it uses less digits than its factorization.

71398642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164553.

The product of its digits is 72576, while the sum is 40.

The square root of 71398642 is about 8449.7717128926. The cubic root of 71398642 is about 414.8553073746.

The spelling of 71398642 in words is "seventy-one million, three hundred ninety-eight thousand, six hundred forty-two".