1421280 has 192 divisors, whose sum is σ = 5806080. Its totient is φ = 317952.

The previous prime is 1421267. The next prime is 1421291. The reversal of 1421280 is 821241.

It is a harmonic number, since the harmonic mean of its divisors is an integer.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30217 + ... + 30263.

It is an arithmetic number, because the mean of its divisors is an integer number (30240).

2^1421280 is an apocalyptic number.

1421280 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 1421280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2903040).

1421280 is an abundant number, since it is smaller than the sum of its proper divisors (4384800).

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

1421280 is a wasteful number, since it uses less digits than its factorization.

1421280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1421280 is about 1192.1744838739. The cubic root of 1421280 is about 112.4328488144.

The spelling of 1421280 in words is "one million, four hundred twenty-one thousand, two hundred eighty".