691420 has 24 divisors (see below), whose sum is σ = 1467648. Its totient is φ = 273600.

The previous prime is 691409. The next prime is 691433. The reversal of 691420 is 24196.

691420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 691391 and 691400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3525 + ... + 3715.

It is an arithmetic number, because the mean of its divisors is an integer number (61152).

2⁶⁹¹⁴²⁰ is an apocalyptic number.

It is an amenable number.

691420 is an abundant number, since it is smaller than the sum of its proper divisors (776228).

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

691420 is a wasteful number, since it uses less digits than its factorization.

691420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 691420 is about 831.5166865433. The cubic root of 691420 is about 88.4261356081.

It can be divided in two parts, 691 and 420, that added together give a palindrome (1111).

The spelling of 691420 in words is "six hundred ninety-one thousand, four hundred twenty".