1261487000 has 32 divisors (see below), whose sum is σ = 2951881920. Its totient is φ = 504594400.

The previous prime is 1261486987. The next prime is 1261487039. The reversal of 1261487000 is 7841621.

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 7 ways as a sum of consecutive naturals, for example, 629744 + ... + 631743.

It is an arithmetic number, because the mean of its divisors is an integer number (92246310).

Almost surely, 2^1261487000 is an apocalyptic number.

1261487000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261487000 is an abundant number, since it is smaller than the sum of its proper divisors (1690394920).

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

1261487000 is a wasteful number, since it uses less digits than its factorization.

1261487000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261508 (or 1261494 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 1261487000 is about 35517.4182620303. The cubic root of 1261487000 is about 1080.5070207370.

The spelling of 1261487000 in words is "one billion, two hundred sixty-one million, four hundred eighty-seven thousand".