72973919 has 4 divisors (see below), whose sum is σ = 73071840. Its totient is φ = 72876000.

The previous prime is 72973909. The next prime is 72973991. The reversal of 72973919 is 91937927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91937927 = 283 ⋅324869.

It is a cyclic number.

It is not a de Polignac number, because 72973919 - 2¹⁶ = 72908383 is a prime.

It is a super-2 number, since 2×72973919² = 10650385708437122, 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 (72973909) 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 3 ways as a sum of consecutive naturals, for example, 47834 + ... + 49335.

It is an arithmetic number, because the mean of its divisors is an integer number (18267960).

Almost surely, 2^72973919 is an apocalyptic number.

72973919 is a deficient number, since it is larger than the sum of its proper divisors (97921).

72973919 is an equidigital number, since it uses as much as digits as its factorization.

72973919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97920.

The product of its digits is 214326, while the sum is 47.

The square root of 72973919 is about 8542.4773338886. The cubic root of 72973919 is about 417.8841414056.

The spelling of 72973919 in words is "seventy-two million, nine hundred seventy-three thousand, nine hundred nineteen".