71999739 has 16 divisors (see below), whose sum is σ = 121904640. Its totient is φ = 41142600.

The previous prime is 71999671. The next prime is 71999771. The reversal of 71999739 is 93799917.

It is not a de Polignac number, because 71999739 - 2¹³ = 71991547 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (71999839) 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 15 ways as a sum of consecutive naturals, for example, 190287 + ... + 190664.

It is an arithmetic number, because the mean of its divisors is an integer number (7619040).

Almost surely, 2^71999739 is an apocalyptic number.

71999739 is a deficient number, since it is larger than the sum of its proper divisors (49904901).

71999739 is a wasteful number, since it uses less digits than its factorization.

71999739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380967 (or 380961 counting only the distinct ones).

The product of its digits is 964467, while the sum is 54.

The square root of 71999739 is about 8485.2659946521. The cubic root of 71999739 is about 416.0162619228.

The spelling of 71999739 in words is "seventy-one million, nine hundred ninety-nine thousand, seven hundred thirty-nine".