691861438 has 8 divisors (see below), whose sum is σ = 1038278880. Its totient is φ = 345768480.

The previous prime is 691861411. The next prime is 691861453. The reversal of 691861438 is 834168196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75718 + ... + 84361.

It is an arithmetic number, because the mean of its divisors is an integer number (129784860).

Almost surely, 2^691861438 is an apocalyptic number.

691861438 is a deficient number, since it is larger than the sum of its proper divisors (346417442).

691861438 is a wasteful number, since it uses less digits than its factorization.

691861438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162242.

The product of its digits is 248832, while the sum is 46.

The square root of 691861438 is about 26303.2590756355. The cubic root of 691861438 is about 884.4495019840.

The spelling of 691861438 in words is "six hundred ninety-one million, eight hundred sixty-one thousand, four hundred thirty-eight".