1209888 has 36 divisors (see below), whose sum is σ = 3441438. Its totient is φ = 403200.

The previous prime is 1209883. The next prime is 1209889. The reversal of 1209888 is 8889021.

It can be written as a sum of positive squares in only one way, i.e., 1192464 + 17424 = 1092^2 + 132^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1209883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1813 + ... + 2388.

2^1209888 is an apocalyptic number.

1209888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1209888 is an abundant number, since it is smaller than the sum of its proper divisors (2231550).

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

1209888 is a wasteful number, since it uses less digits than its factorization.

1209888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4217 (or 4206 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1209888 is about 1099.9490897310. The cubic root of 1209888 is about 106.5569357667.

The spelling of 1209888 in words is "one million, two hundred nine thousand, eight hundred eighty-eight".