1287900 has 108 divisors (see below), whose sum is σ = 4265352. Its totient is φ = 336960.

The previous prime is 1287899. The next prime is 1287917. The reversal of 1287900 is 97821.

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 24274 + ... + 24326.

It is an arithmetic number, because the mean of its divisors is an integer number (39494).

2^1287900 is an apocalyptic number.

1287900 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 1287900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2132676).

1287900 is an abundant number, since it is smaller than the sum of its proper divisors (2977452).

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

1287900 is a wasteful number, since it uses less digits than its factorization.

1287900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1287900 is about 1134.8568191627. The cubic root of 1287900 is about 108.7996206374.

It can be divided in two parts, 1287 and 900, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1287900 in words is "one million, two hundred eighty-seven thousand, nine hundred".