72394919 has 4 divisors (see below), whose sum is σ = 73035696. Its totient is φ = 71754144.

The previous prime is 72394913. The next prime is 72394969. The reversal of 72394919 is 91949327.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72394919 - 2¹² = 72390823 is a prime.

It is a super-2 number, since 2×72394919² = 10482048594033122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72394919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72394913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320219 + ... + 320444.

It is an arithmetic number, because the mean of its divisors is an integer number (18258924).

Almost surely, 2^72394919 is an apocalyptic number.

72394919 is a deficient number, since it is larger than the sum of its proper divisors (640777).

72394919 is a wasteful number, since it uses less digits than its factorization.

72394919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640776.

The product of its digits is 122472, while the sum is 44.

The square root of 72394919 is about 8508.5203766577. The cubic root of 72394919 is about 416.7759935696.

The spelling of 72394919 in words is "seventy-two million, three hundred ninety-four thousand, nine hundred nineteen".