71390399 has 4 divisors (see below), whose sum is σ = 71485464. Its totient is φ = 71295336.

The previous prime is 71390387. The next prime is 71390401. The reversal of 71390399 is 99309317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99309317 = 43 ⋅2309519.

It is a cyclic number.

It is not a de Polignac number, because 71390399 - 2¹² = 71386303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71390339) 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, 46397 + ... + 47910.

It is an arithmetic number, because the mean of its divisors is an integer number (17871366).

Almost surely, 2^71390399 is an apocalyptic number.

71390399 is a deficient number, since it is larger than the sum of its proper divisors (95065).

71390399 is an equidigital number, since it uses as much as digits as its factorization.

71390399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95064.

The product of its (nonzero) digits is 45927, while the sum is 41.

The square root of 71390399 is about 8449.2839341568. The cubic root of 71390399 is about 414.8393416932.

The spelling of 71390399 in words is "seventy-one million, three hundred ninety thousand, three hundred ninety-nine".