1685426988 has 96 divisors (see below), whose sum is σ = 4923072000. Its totient is φ = 437584896.

The previous prime is 1685426987. The next prime is 1685426989. The reversal of 1685426988 is 8896245861.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1685426987) and next prime (1685426989).

It is a super-5 number, since 5×1685426988⁵ (a number of 47 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (1685426987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21063 + ... + 61761.

It is an arithmetic number, because the mean of its divisors is an integer number (51282000).

Almost surely, 2^1685426988 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 1685426988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2461536000).

1685426988 is an abundant number, since it is smaller than the sum of its proper divisors (3237645012).

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

1685426988 is a wasteful number, since it uses less digits than its factorization.

1685426988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40759 (or 40757 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 57.

The square root of 1685426988 is about 41053.9521605411. The cubic root of 1685426988 is about 1190.0630778889.

The spelling of 1685426988 in words is "one billion, six hundred eighty-five million, four hundred twenty-six thousand, nine hundred eighty-eight".