691740938 has 12 divisors (see below), whose sum is σ = 1207017522. Its totient is φ = 296460360.

The previous prime is 691740911. The next prime is 691740941. The reversal of 691740938 is 839047196.

It can be written as a sum of positive squares in only one way, i.e., 599907049 + 91833889 = 24493^2 + 9583^2 .

It is a junction number, because it is equal to n+sod(n) for n = 691740892 and 691740901.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3529193 + ... + 3529388.

Almost surely, 2^691740938 is an apocalyptic number.

691740938 is a deficient number, since it is larger than the sum of its proper divisors (515276584).

691740938 is a wasteful number, since it uses less digits than its factorization.

691740938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7058597 (or 7058590 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 691740938 is about 26300.9683852135. The cubic root of 691740938 is about 884.3981514548.

The spelling of 691740938 in words is "six hundred ninety-one million, seven hundred forty thousand, nine hundred thirty-eight".