1286420 has 24 divisors (see below), whose sum is σ = 2727648. Its totient is φ = 509600.

The previous prime is 1286419. The next prime is 1286447. The reversal of 1286420 is 246821.

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 7 ways as a sum of consecutive naturals, for example, 2375 + ... + 2865.

It is an arithmetic number, because the mean of its divisors is an integer number (113652).

2^1286420 is an apocalyptic number.

1286420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1286420 is an abundant number, since it is smaller than the sum of its proper divisors (1441228).

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

1286420 is a wasteful number, since it uses less digits than its factorization.

1286420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 1286420 is about 1134.2045670866. The cubic root of 1286420 is about 108.7579286948.

The spelling of 1286420 in words is "one million, two hundred eighty-six thousand, four hundred twenty".