72399871 has 8 divisors (see below), whose sum is σ = 73248560. Its totient is φ = 71554752.

The previous prime is 72399869. The next prime is 72399893. The reversal of 72399871 is 17899327.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72399871 - 2¹ = 72399869 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 (72399841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69571 + ... + 70603.

It is an arithmetic number, because the mean of its divisors is an integer number (9156070).

Almost surely, 2^72399871 is an apocalyptic number.

72399871 is a deficient number, since it is larger than the sum of its proper divisors (848689).

72399871 is a wasteful number, since it uses less digits than its factorization.

72399871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785.

The product of its digits is 190512, while the sum is 46.

The square root of 72399871 is about 8508.8113740992. The cubic root of 72399871 is about 416.7854962055.

The spelling of 72399871 in words is "seventy-two million, three hundred ninety-nine thousand, eight hundred seventy-one".