1278723 has 8 divisors (see below), whose sum is σ = 1805328. Its totient is φ = 802304.

The previous prime is 1278721. The next prime is 1278733. The reversal of 1278723 is 3278721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1278723 - 2¹ = 1278721 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (1278721) 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, 12486 + ... + 12587.

It is an arithmetic number, because the mean of its divisors is an integer number (225666).

2^1278723 is an apocalyptic number.

1278723 is a deficient number, since it is larger than the sum of its proper divisors (526605).

1278723 is a wasteful number, since it uses less digits than its factorization.

1278723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25093.

The product of its digits is 4704, while the sum is 30.

The square root of 1278723 is about 1130.8063494693. The cubic root of 1278723 is about 108.5405852402.

The spelling of 1278723 in words is "one million, two hundred seventy-eight thousand, seven hundred twenty-three".