72921443 has 4 divisors (see below), whose sum is σ = 83338800. Its totient is φ = 62504088.

The previous prime is 72921427. The next prime is 72921479. The reversal of 72921443 is 34412927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34412927 = 1553 ⋅22159.

It is a cyclic number.

It is not a de Polignac number, because 72921443 - 2⁴ = 72921427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72920443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5208668 + ... + 5208681.

It is an arithmetic number, because the mean of its divisors is an integer number (20834700).

Almost surely, 2^72921443 is an apocalyptic number.

72921443 is a deficient number, since it is larger than the sum of its proper divisors (10417357).

72921443 is a wasteful number, since it uses less digits than its factorization.

72921443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10417356.

The product of its digits is 12096, while the sum is 32.

The square root of 72921443 is about 8539.4053071628. The cubic root of 72921443 is about 417.7839496887.

The spelling of 72921443 in words is "seventy-two million, nine hundred twenty-one thousand, four hundred forty-three".