1659890540 has 384 divisors, whose sum is σ = 5016453120. Its totient is φ = 445132800.

The previous prime is 1659890537. The next prime is 1659890569. The reversal of 1659890540 is 450989561.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (47).

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, 23378705 + ... + 23378775.

It is an arithmetic number, because the mean of its divisors is an integer number (13063680).

Almost surely, 2^1659890540 is an apocalyptic number.

1659890540 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 1659890540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2508226560).

1659890540 is an abundant number, since it is smaller than the sum of its proper divisors (3356562580).

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

1659890540 is a wasteful number, since it uses less digits than its factorization.

1659890540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 1659890540 is about 40741.7542577636. The cubic root of 1659890540 is about 1184.0221216877.

The spelling of 1659890540 in words is "one billion, six hundred fifty-nine million, eight hundred ninety thousand, five hundred forty".