897749 has 4 divisors (see below), whose sum is σ = 901836. Its totient is φ = 893664.

The previous prime is 897727. The next prime is 897751. The reversal of 897749 is 947798.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 947798 = 2 ⋅473899.

It can be written as a sum of positive squares in 2 ways, for example, as 611524 + 286225 = 782^2 + 535^2 .

It is a cyclic number.

It is not a de Polignac number, because 897749 - 2¹² = 893653 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897709) 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, 1694 + ... + 2159.

It is an arithmetic number, because the mean of its divisors is an integer number (225459).

2⁸⁹⁷⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

897749 is a deficient number, since it is larger than the sum of its proper divisors (4087).

897749 is a wasteful number, since it uses less digits than its factorization.

897749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4086.

The product of its digits is 127008, while the sum is 44.

The square root of 897749 is about 947.4961741348. The cubic root of 897749 is about 96.4683780521.

The spelling of 897749 in words is "eight hundred ninety-seven thousand, seven hundred forty-nine".