1278902 has 4 divisors (see below), whose sum is σ = 1918356. Its totient is φ = 639450.

The previous prime is 1278899. The next prime is 1278911. The reversal of 1278902 is 2098721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2098721 = 19 ⋅110459.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319724 + ... + 319727.

It is an arithmetic number, because the mean of its divisors is an integer number (479589).

2^1278902 is an apocalyptic number.

1278902 is a deficient number, since it is larger than the sum of its proper divisors (639454).

1278902 is an equidigital number, since it uses as much as digits as its factorization.

1278902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639453.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1278902 is about 1130.8854937614. The cubic root of 1278902 is about 108.5456496308.

The spelling of 1278902 in words is "one million, two hundred seventy-eight thousand, nine hundred two".