1281402 has 24 divisors (see below), whose sum is σ = 2797236. Its totient is φ = 423936.

The previous prime is 1281389. The next prime is 1281407. The reversal of 1281402 is 2041821.

It can be written as a sum of positive squares in 2 ways, for example, as 1252161 + 29241 = 1119^2 + 171^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1281407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4488 + ... + 4764.

2^1281402 is an apocalyptic number.

1281402 is an abundant number, since it is smaller than the sum of its proper divisors (1515834).

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

1281402 is a wasteful number, since it uses less digits than its factorization.

1281402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1281402 is about 1131.9902826438. The cubic root of 1281402 is about 108.6163320065.

The spelling of 1281402 in words is "one million, two hundred eighty-one thousand, four hundred two".