1278407 has 8 divisors (see below), whose sum is σ = 1424640. Its totient is φ = 1139040.

The previous prime is 1278401. The next prime is 1278419. The reversal of 1278407 is 7048721.

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 1278407 - 2⁴ = 1278391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1278407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278401) 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, 1319 + ... + 2072.

It is an arithmetic number, because the mean of its divisors is an integer number (178080).

2^1278407 is an apocalyptic number.

1278407 is a deficient number, since it is larger than the sum of its proper divisors (146233).

1278407 is a wasteful number, since it uses less digits than its factorization.

1278407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3433.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 1278407 is about 1130.6666175314. Note that the first 4 decimals coincide. The cubic root of 1278407 is about 108.5316435980.

The spelling of 1278407 in words is "one million, two hundred seventy-eight thousand, four hundred seven".