697840 has 80 divisors (see below), whose sum is σ = 1937376. Its totient is φ = 230400.

The previous prime is 697831. The next prime is 697877. The reversal of 697840 is 48796.

697840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 697796 and 697805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11410 + ... + 11470.

2⁶⁹⁷⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 697840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (968688).

697840 is an abundant number, since it is smaller than the sum of its proper divisors (1239536).

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

697840 is a wasteful number, since it uses less digits than its factorization.

697840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 697840 is about 835.3681823005. The cubic root of 697840 is about 88.6989788075.

The spelling of 697840 in words is "six hundred ninety-seven thousand, eight hundred forty".