685442919 has 24 divisors (see below), whose sum is σ = 1087870080. Its totient is φ = 382569264.

The previous prime is 685442887. The next prime is 685442939. The reversal of 685442919 is 919244586.

It is not a de Polignac number, because 685442919 - 2⁵ = 685442887 is a prime.

It is a super-3 number, since 3×685442919³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685442939) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47899 + ... + 60540.

It is an arithmetic number, because the mean of its divisors is an integer number (45327920).

Almost surely, 2^685442919 is an apocalyptic number.

685442919 is a deficient number, since it is larger than the sum of its proper divisors (402427161).

685442919 is a wasteful number, since it uses less digits than its factorization.

685442919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108499 (or 108492 counting only the distinct ones).

The product of its digits is 622080, while the sum is 48.

The square root of 685442919 is about 26180.9648217937. The cubic root of 685442919 is about 881.7059362339.

The spelling of 685442919 in words is "six hundred eighty-five million, four hundred forty-two thousand, nine hundred nineteen".