72440999 has 4 divisors (see below), whose sum is σ = 72458064. Its totient is φ = 72423936.

The previous prime is 72440933. The next prime is 72441001. The reversal of 72440999 is 99904427.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 72440999 - 2⁸ = 72440743 is a prime.

It is a super-2 number, since 2×72440999² = 10495396672236002, 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 (72440909) 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, 3374 + ... + 12500.

It is an arithmetic number, because the mean of its divisors is an integer number (18114516).

Almost surely, 2^72440999 is an apocalyptic number.

72440999 is a deficient number, since it is larger than the sum of its proper divisors (17065).

72440999 is an equidigital number, since it uses as much as digits as its factorization.

72440999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17064.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 72440999 is about 8511.2278197684. The cubic root of 72440999 is about 416.8644020047.

The spelling of 72440999 in words is "seventy-two million, four hundred forty thousand, nine hundred ninety-nine".