1641789240 has 512 divisors, whose sum is σ = 6570547200. Its totient is φ = 318504960.

The previous prime is 1641789223. The next prime is 1641789251. The reversal of 1641789240 is 429871461.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1641789192 and 1641789201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8506584 + ... + 8506776.

It is an arithmetic number, because the mean of its divisors is an integer number (12833100).

Almost surely, 2^1641789240 is an apocalyptic number.

1641789240 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 1641789240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3285273600).

1641789240 is an abundant number, since it is smaller than the sum of its proper divisors (4928757960).

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

1641789240 is a wasteful number, since it uses less digits than its factorization.

1641789240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 1641789240 is about 40518.9985068733. The cubic root of 1641789240 is about 1179.7024146640.

The spelling of 1641789240 in words is "one billion, six hundred forty-one million, seven hundred eighty-nine thousand, two hundred forty".