897620391 has 12 divisors (see below), whose sum is σ = 1297627032. Its totient is φ = 597922416.

The previous prime is 897620387. The next prime is 897620393. The reversal of 897620391 is 193026798.

It is not a de Polignac number, because 897620391 - 2² = 897620387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897620393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29181 + ... + 51446.

It is an arithmetic number, because the mean of its divisors is an integer number (108135586).

Almost surely, 2^897620391 is an apocalyptic number.

897620391 is a deficient number, since it is larger than the sum of its proper divisors (400006641).

897620391 is a wasteful number, since it uses less digits than its factorization.

897620391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81870 (or 81867 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 897620391 is about 29960.3135998274. The cubic root of 897620391 is about 964.6377123581.

The spelling of 897620391 in words is "eight hundred ninety-seven million, six hundred twenty thousand, three hundred ninety-one".