1659139920 has 120 divisors (see below), whose sum is σ = 5580047616. Its totient is φ = 441794304.

The previous prime is 1659139919. The next prime is 1659139927. The reversal of 1659139920 is 299319561.

It is a happy number.

1659139920 is a `hidden beast` number, since 1 + 6 + 591 + 39 + 9 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659139927) 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, 695049 + ... + 697431.

Almost surely, 2^1659139920 is an apocalyptic number.

1659139920 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 1659139920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2790023808).

1659139920 is an abundant number, since it is smaller than the sum of its proper divisors (3920907696).

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

1659139920 is a wasteful number, since it uses less digits than its factorization.

1659139920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3369 (or 3360 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 1659139920 is about 40732.5412907174. The cubic root of 1659139920 is about 1183.8436190164.

The spelling of 1659139920 in words is "one billion, six hundred fifty-nine million, one hundred thirty-nine thousand, nine hundred twenty".