72292421 has 4 divisors (see below), whose sum is σ = 72325644. Its totient is φ = 72259200.

The previous prime is 72292387. The next prime is 72292433. The reversal of 72292421 is 12429227.

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

It can be written as a sum of positive squares in 2 ways, for example, as 60996100 + 11296321 = 7810^2 + 3361^2 .

It is a cyclic number.

It is not a de Polignac number, because 72292421 - 2¹⁰ = 72291397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72292021) 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, 13100 + ... + 17781.

It is an arithmetic number, because the mean of its divisors is an integer number (18081411).

Almost surely, 2^72292421 is an apocalyptic number.

It is an amenable number.

72292421 is a deficient number, since it is larger than the sum of its proper divisors (33223).

72292421 is a wasteful number, since it uses less digits than its factorization.

72292421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33222.

The product of its digits is 4032, while the sum is 29.

The square root of 72292421 is about 8502.4949867671. The cubic root of 72292421 is about 416.5792077413.

The spelling of 72292421 in words is "seventy-two million, two hundred ninety-two thousand, four hundred twenty-one".