1290001660 has 12 divisors (see below), whose sum is σ = 2709003528. Its totient is φ = 516000656.

The previous prime is 1290001649. The next prime is 1290001663. The reversal of 1290001660 is 661000921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290001663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32250022 + ... + 32250061.

It is an arithmetic number, because the mean of its divisors is an integer number (225750294).

Almost surely, 2^1290001660 is an apocalyptic number.

1290001660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1290001660 is an abundant number, since it is smaller than the sum of its proper divisors (1419001868).

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

1290001660 is a wasteful number, since it uses less digits than its factorization.

1290001660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64500092 (or 64500090 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1290001660 is about 35916.5931012394. The cubic root of 1290001660 is about 1088.5877003920.

The spelling of 1290001660 in words is "one billion, two hundred ninety million, one thousand, six hundred sixty".