691923492 has 192 divisors, whose sum is σ = 2016636160. Its totient is φ = 203793408.

The previous prime is 691923481. The next prime is 691923509. The reversal of 691923492 is 294329196.

It is a happy number.

691923492 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4407078 + ... + 4407234.

Almost surely, 2^691923492 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 691923492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1008318080).

691923492 is an abundant number, since it is smaller than the sum of its proper divisors (1324712668).

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

691923492 is a wasteful number, since it uses less digits than its factorization.

691923492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 291 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 691923492 is about 26304.4386368537. The cubic root of 691923492 is about 884.4759436892.

The spelling of 691923492 in words is "six hundred ninety-one million, nine hundred twenty-three thousand, four hundred ninety-two".