1278420 has 96 divisors (see below), whose sum is σ = 4233600. Its totient is φ = 284160.

The previous prime is 1278419. The next prime is 1278437. The reversal of 1278420 is 248721.

It is an Ulam number.

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, 8506 + ... + 8654.

It is an arithmetic number, because the mean of its divisors is an integer number (44100).

2^1278420 is an apocalyptic number.

1278420 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 1278420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2116800).

1278420 is an abundant number, since it is smaller than the sum of its proper divisors (2955180).

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

1278420 is a wasteful number, since it uses less digits than its factorization.

1278420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 1278420 is about 1130.6723663378. The cubic root of 1278420 is about 108.5320114794.

The spelling of 1278420 in words is "one million, two hundred seventy-eight thousand, four hundred twenty".