72207397 has 4 divisors (see below), whose sum is σ = 72509760. Its totient is φ = 71905036.

The previous prime is 72207389. The next prime is 72207407. The reversal of 72207397 is 79370227.

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 72207397 - 2³ = 72207389 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 (72207367) 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, 150823 + ... + 151300.

It is an arithmetic number, because the mean of its divisors is an integer number (18127440).

Almost surely, 2^72207397 is an apocalyptic number.

It is an amenable number.

72207397 is a deficient number, since it is larger than the sum of its proper divisors (302363).

72207397 is a wasteful number, since it uses less digits than its factorization.

72207397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302362.

The product of its (nonzero) digits is 37044, while the sum is 37.

The square root of 72207397 is about 8497.4935716363. The cubic root of 72207397 is about 416.4158290412.

The spelling of 72207397 in words is "seventy-two million, two hundred seven thousand, three hundred ninety-seven".