72421841 has 4 divisors (see below), whose sum is σ = 73502832. Its totient is φ = 71340852.

The previous prime is 72421837. The next prime is 72421861. The reversal of 72421841 is 14812427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72421841 - 2² = 72421837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72421801) 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, 540395 + ... + 540528.

It is an arithmetic number, because the mean of its divisors is an integer number (18375708).

Almost surely, 2^72421841 is an apocalyptic number.

It is an amenable number.

72421841 is a deficient number, since it is larger than the sum of its proper divisors (1080991).

72421841 is a wasteful number, since it uses less digits than its factorization.

72421841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080990.

The product of its digits is 3584, while the sum is 29.

The square root of 72421841 is about 8510.1022908071. The cubic root of 72421841 is about 416.8276502920.

The spelling of 72421841 in words is "seventy-two million, four hundred twenty-one thousand, eight hundred forty-one".