71870389 has 4 divisors (see below), whose sum is σ = 72882720. Its totient is φ = 70858060.

The previous prime is 71870371. The next prime is 71870411. The reversal of 71870389 is 98307817.

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.

It is a cyclic number.

It is not a de Polignac number, because 71870389 - 2⁹ = 71869877 is a prime.

It is a super-2 number, since 2×71870389² = 10330705630022642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71870789) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 506059 + ... + 506200.

It is an arithmetic number, because the mean of its divisors is an integer number (18220680).

Almost surely, 2^71870389 is an apocalyptic number.

It is an amenable number.

71870389 is a deficient number, since it is larger than the sum of its proper divisors (1012331).

71870389 is a wasteful number, since it uses less digits than its factorization.

71870389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012330.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 71870389 is about 8477.6405326010. The cubic root of 71870389 is about 415.7669834241.

The spelling of 71870389 in words is "seventy-one million, eight hundred seventy thousand, three hundred eighty-nine".