1421888 has 28 divisors (see below), whose sum is σ = 3040380. Its totient is φ = 655872.

The previous prime is 1421867. The next prime is 1421909. The reversal of 1421888 is 8881241.

It is an interprime number because it is at equal distance from previous prime (1421867) and next prime (1421909).

It can be written as a sum of positive squares in 2 ways, for example, as 238144 + 1183744 = 488^2 + 1088^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 8.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23 + ... + 1686.

It is an arithmetic number, because the mean of its divisors is an integer number (108585).

2^1421888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1520190).

1421888 is an abundant number, since it is smaller than the sum of its proper divisors (1618492).

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

1421888 is a wasteful number, since it uses less digits than its factorization.

1421888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734 (or 1724 counting only the distinct ones).

The product of its digits is 4096, while the sum is 32.

The square root of 1421888 is about 1192.4294528399. The cubic root of 1421888 is about 112.4488788311.

The spelling of 1421888 in words is "one million, four hundred twenty-one thousand, eight hundred eighty-eight".