72189426 has 8 divisors (see below), whose sum is σ = 144378864. Its totient is φ = 24063140.

The previous prime is 72189409. The next prime is 72189427. The reversal of 72189426 is 62498127.

It is a sphenic number, since it is the product of 3 distinct primes.

72189426 is an admirable number.

It is a super-2 number, since 2×72189426² = 10422626452418952, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72189427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6015780 + ... + 6015791.

It is an arithmetic number, because the mean of its divisors is an integer number (18047358).

Almost surely, 2^72189426 is an apocalyptic number.

72189426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72189426 is a wasteful number, since it uses less digits than its factorization.

72189426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12031576.

The product of its digits is 48384, while the sum is 39.

The square root of 72189426 is about 8496.4360763793. The cubic root of 72189426 is about 416.3812802735.

The spelling of 72189426 in words is "seventy-two million, one hundred eighty-nine thousand, four hundred twenty-six".