1285642 has 8 divisors (see below), whose sum is σ = 2041956. Its totient is φ = 604992.

The previous prime is 1285633. The next prime is 1285649. The reversal of 1285642 is 2465821.

It can be written as a sum of positive squares in 2 ways, for example, as 1212201 + 73441 = 1101^2 + 271^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1285642.

It is not an unprimeable number, because it can be changed into a prime (1285649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18873 + ... + 18940.

2^1285642 is an apocalyptic number.

1285642 is a deficient number, since it is larger than the sum of its proper divisors (756314).

1285642 is a wasteful number, since it uses less digits than its factorization.

1285642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37832.

The product of its digits is 3840, while the sum is 28.

The square root of 1285642 is about 1133.8615435758. The cubic root of 1285642 is about 108.7359994307.

It can be divided in two parts, 1285 and 642, that multiplied together give a triangular number (824970 = T₁₂₈₄).

The spelling of 1285642 in words is "one million, two hundred eighty-five thousand, six hundred forty-two".