1278000 has 120 divisors (see below), whose sum is σ = 4526496. Its totient is φ = 336000.

The previous prime is 1277993. The next prime is 1278007. The reversal of 1278000 is 8721.

It is an interprime number because it is at equal distance from previous prime (1277993) and next prime (1278007).

It is a tau number, because it is divible by the number of its divisors (120).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (1278007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17965 + ... + 18035.

2^1278000 is an apocalyptic number.

1278000 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 1278000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2263248).

1278000 is an abundant number, since it is smaller than the sum of its proper divisors (3248496).

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

1278000 is a wasteful number, since it uses less digits than its factorization.

1278000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 1278000 is about 1130.4866208850. The cubic root of 1278000 is about 108.5201248179.

The spelling of 1278000 in words is "one million, two hundred seventy-eight thousand".