691416 has 80 divisors (see below), whose sum is σ = 2134440. Its totient is φ = 207360.

The previous prime is 691409. The next prime is 691433. The reversal of 691416 is 614196.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 691416.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691416.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7080 + ... + 7176.

2⁶⁹¹⁴¹⁶ is an apocalyptic number.

691416 is a gapful number since it is divisible by the number (66) 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 691416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1067220).

691416 is an abundant number, since it is smaller than the sum of its proper divisors (1443024).

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

691416 is a wasteful number, since it uses less digits than its factorization.

691416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 113 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 691416 is about 831.5142812965. The cubic root of 691416 is about 88.4259650869.

It can be divided in two parts, 69 and 1416, that added together give a triangular number (1485 = T₅₄).

The spelling of 691416 in words is "six hundred ninety-one thousand, four hundred sixteen".