720197391 has 8 divisors (see below), whose sum is σ = 971832960. Its totient is φ = 474346712.

The previous prime is 720197389. The next prime is 720197393. The reversal of 720197391 is 193791027.

It is an interprime number because it is at equal distance from previous prime (720197389) and next prime (720197393).

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

It is a cyclic number.

It is not a de Polignac number, because 720197391 - 2¹ = 720197389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720197393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1445931 + ... + 1446428.

It is an arithmetic number, because the mean of its divisors is an integer number (121479120).

Almost surely, 2^720197391 is an apocalyptic number.

720197391 is a deficient number, since it is larger than the sum of its proper divisors (251635569).

720197391 is a wasteful number, since it uses less digits than its factorization.

720197391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2892445.

The product of its (nonzero) digits is 23814, while the sum is 39.

The square root of 720197391 is about 26836.4936420539. The cubic root of 720197391 is about 896.3628482132.

The spelling of 720197391 in words is "seven hundred twenty million, one hundred ninety-seven thousand, three hundred ninety-one".