1290945888 has 36 divisors (see below), whose sum is σ = 3671128188. Its totient is φ = 430315200.

The previous prime is 1290945869. The next prime is 1290945893. The reversal of 1290945888 is 8885490921.

It is a tau number, because it is divible by the number of its divisors (36).

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 5 ways as a sum of consecutive naturals, for example, 2240938 + ... + 2241513.

It is an arithmetic number, because the mean of its divisors is an integer number (101975783).

Almost surely, 2^1290945888 is an apocalyptic number.

1290945888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1290945888 is an abundant number, since it is smaller than the sum of its proper divisors (2380182300).

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

1290945888 is a wasteful number, since it uses less digits than its factorization.

1290945888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4482467 (or 4482456 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The square root of 1290945888 is about 35929.7354290287. The cubic root of 1290945888 is about 1088.8532360455.

The spelling of 1290945888 in words is "one billion, two hundred ninety million, nine hundred forty-five thousand, eight hundred eighty-eight".