1660438040 has 16 divisors (see below), whose sum is σ = 3735985680. Its totient is φ = 664175200.

The previous prime is 1660438033. The next prime is 1660438061. The reversal of 1660438040 is 408340661.

It is a junction number, because it is equal to n+sod(n) for n = 1660437988 and 1660438006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20755436 + ... + 20755515.

It is an arithmetic number, because the mean of its divisors is an integer number (233499105).

Almost surely, 2^1660438040 is an apocalyptic number.

1660438040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660438040 is an abundant number, since it is smaller than the sum of its proper divisors (2075547640).

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

1660438040 is a wasteful number, since it uses less digits than its factorization.

1660438040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41510962 (or 41510958 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 1660438040 is about 40748.4728548200. The cubic root of 1660438040 is about 1184.1522870682.

The spelling of 1660438040 in words is "one billion, six hundred sixty million, four hundred thirty-eight thousand, forty".