1275978 has 16 divisors (see below), whose sum is σ = 2784096. Its totient is φ = 386640.

The previous prime is 1275977. The next prime is 1275979. The reversal of 1275978 is 8795721.

It is an interprime number because it is at equal distance from previous prime (1275977) and next prime (1275979).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1275973) 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, 9601 + ... + 9732.

It is an arithmetic number, because the mean of its divisors is an integer number (174006).

2^1275978 is an apocalyptic number.

1275978 is an abundant number, since it is smaller than the sum of its proper divisors (1508118).

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

1275978 is a wasteful number, since it uses less digits than its factorization.

1275978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19349.

The product of its digits is 35280, while the sum is 39.

The square root of 1275978 is about 1129.5919617278. The cubic root of 1275978 is about 108.4628625546.

It can be divided in two parts, 127 and 5978, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 1275978 in words is "one million, two hundred seventy-five thousand, nine hundred seventy-eight".