1288402 has 4 divisors (see below), whose sum is σ = 1932606. Its totient is φ = 644200.

The previous prime is 1288393. The next prime is 1288421. The reversal of 1288402 is 2048821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 962361 + 326041 = 981^2 + 571^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322099 + ... + 322102.

2^1288402 is an apocalyptic number.

1288402 is a deficient number, since it is larger than the sum of its proper divisors (644204).

1288402 is an equidigital number, since it uses as much as digits as its factorization.

1288402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644203.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 1288402 is about 1135.0779708901. The cubic root of 1288402 is about 108.8137548390.

The spelling of 1288402 in words is "one million, two hundred eighty-eight thousand, four hundred two".