1278540 has 36 divisors (see below), whose sum is σ = 3878784. Its totient is φ = 340896.

The previous prime is 1278527. The next prime is 1278551. The reversal of 1278540 is 458721.

It is a tau number, because it is divible by the number of its divisors (36).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3372 + ... + 3731.

It is an arithmetic number, because the mean of its divisors is an integer number (107744).

2^1278540 is an apocalyptic number.

1278540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278540 is an abundant number, since it is smaller than the sum of its proper divisors (2600244).

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

1278540 is a wasteful number, since it uses less digits than its factorization.

1278540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7118 (or 7113 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1278540 is about 1130.7254308629. The cubic root of 1278540 is about 108.5354071903.

The spelling of 1278540 in words is "one million, two hundred seventy-eight thousand, five hundred forty".