71839901 has 4 divisors (see below), whose sum is σ = 82102752. Its totient is φ = 61577052.

The previous prime is 71839897. The next prime is 71839921. The reversal of 71839901 is 10993817.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10993817 = 47 ⋅233911.

It is a cyclic number.

It is not a de Polignac number, because 71839901 - 2² = 71839897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71839921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5131415 + ... + 5131428.

It is an arithmetic number, because the mean of its divisors is an integer number (20525688).

Almost surely, 2^71839901 is an apocalyptic number.

It is an amenable number.

71839901 is a deficient number, since it is larger than the sum of its proper divisors (10262851).

71839901 is a wasteful number, since it uses less digits than its factorization.

71839901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10262850.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 71839901 is about 8475.8422000412. The cubic root of 71839901 is about 415.7081845372.

The spelling of 71839901 in words is "seventy-one million, eight hundred thirty-nine thousand, nine hundred one".