1278342 has 40 divisors (see below), whose sum is σ = 3089856. Its totient is φ = 392688.

The previous prime is 1278341. The next prime is 1278371. The reversal of 1278342 is 2438721.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278341) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1803 + ... + 2409.

2^1278342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1544928).

1278342 is an abundant number, since it is smaller than the sum of its proper divisors (1811514).

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

1278342 is a wasteful number, since it uses less digits than its factorization.

1278342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634 (or 625 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 1278342 is about 1130.6378730610. The cubic root of 1278342 is about 108.5298041534.

The spelling of 1278342 in words is "one million, two hundred seventy-eight thousand, three hundred forty-two".