1278780 has 24 divisors (see below), whose sum is σ = 3580752. Its totient is φ = 340992.

The previous prime is 1278779. The next prime is 1278787. The reversal of 1278780 is 878721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10597 + ... + 10716.

It is an arithmetic number, because the mean of its divisors is an integer number (149198).

2^1278780 is an apocalyptic number.

1278780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278780 is an abundant number, since it is smaller than the sum of its proper divisors (2301972).

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

1278780 is a wasteful number, since it uses less digits than its factorization.

1278780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21325 (or 21323 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 1278780 is about 1130.8315524427. The cubic root of 1278780 is about 108.5421979745.

The spelling of 1278780 in words is "one million, two hundred seventy-eight thousand, seven hundred eighty".