1691283840 has 128 divisors (see below), whose sum is σ = 5625504000. Its totient is φ = 431388672.

The previous prime is 1691283761. The next prime is 1691283871. The reversal of 1691283840 is 483821961.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 1691283792 and 1691283801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25011 + ... + 63309.

It is an arithmetic number, because the mean of its divisors is an integer number (43949250).

Almost surely, 2^1691283840 is an apocalyptic number.

1691283840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1691283840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2812752000).

1691283840 is an abundant number, since it is smaller than the sum of its proper divisors (3934220160).

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

1691283840 is a wasteful number, since it uses less digits than its factorization.

1691283840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38344 (or 38332 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 1691283840 is about 41125.2214583703. The cubic root of 1691283840 is about 1191.4399723528.

The spelling of 1691283840 in words is "one billion, six hundred ninety-one million, two hundred eighty-three thousand, eight hundred forty".