897643739 has 2 divisors, whose sum is σ = 897643740. Its totient is φ = 897643738.

The previous prime is 897643729. The next prime is 897643753. The reversal of 897643739 is 937346798.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 897643739 - 2²⁴ = 880866523 is a prime.

It is not a weakly prime, because it can be changed into another prime (897643729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448821869 + 448821870.

It is an arithmetic number, because the mean of its divisors is an integer number (448821870).

Almost surely, 2^897643739 is an apocalyptic number.

897643739 is a deficient number, since it is larger than the sum of its proper divisors (1).

897643739 is an equidigital number, since it uses as much as digits as its factorization.

897643739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 56.

The square root of 897643739 is about 29960.7032460855. The cubic root of 897643739 is about 964.6460760147.

The spelling of 897643739 in words is "eight hundred ninety-seven million, six hundred forty-three thousand, seven hundred thirty-nine".