897209440 has 96 divisors (see below), whose sum is σ = 2229970176. Its totient is φ = 340654080.

The previous prime is 897209429. The next prime is 897209441. The reversal of 897209440 is 44902798.

It is a super-2 number, since 2×897209440² = 1609969558450227200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897209441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261174 + ... + 264586.

It is an arithmetic number, because the mean of its divisors is an integer number (23228856).

Almost surely, 2^897209440 is an apocalyptic number.

897209440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 897209440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1114985088).

897209440 is an abundant number, since it is smaller than the sum of its proper divisors (1332760736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

897209440 is a wasteful number, since it uses less digits than its factorization.

897209440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3512 (or 3504 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 897209440 is about 29953.4545586982. The cubic root of 897209440 is about 964.4904788696.

The spelling of 897209440 in words is "eight hundred ninety-seven million, two hundred nine thousand, four hundred forty".