72197389 has 16 divisors (see below), whose sum is σ = 80317440. Its totient is φ = 64350000.

The previous prime is 72197347. The next prime is 72197393. The reversal of 72197389 is 98379127.

It is a happy number.

It is not a de Polignac number, because 72197389 - 2⁷ = 72197261 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 (72197309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217954 + ... + 218284.

It is an arithmetic number, because the mean of its divisors is an integer number (5019840).

Almost surely, 2^72197389 is an apocalyptic number.

72197389 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

72197389 is a deficient number, since it is larger than the sum of its proper divisors (8120051).

72197389 is a wasteful number, since it uses less digits than its factorization.

72197389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672.

The product of its digits is 190512, while the sum is 46.

The square root of 72197389 is about 8496.9046717025. The cubic root of 72197389 is about 416.3965896358.

The spelling of 72197389 in words is "seventy-two million, one hundred ninety-seven thousand, three hundred eighty-nine".