1275638 has 32 divisors (see below), whose sum is σ = 2424576. Its totient is φ = 489888.

The previous prime is 1275611. The next prime is 1275643. The reversal of 1275638 is 8365721.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7745 + ... + 7907.

It is an arithmetic number, because the mean of its divisors is an integer number (75768).

2^1275638 is an apocalyptic number.

1275638 is a deficient number, since it is larger than the sum of its proper divisors (1148938).

1275638 is a wasteful number, since it uses less digits than its factorization.

1275638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228.

The product of its digits is 10080, while the sum is 32.

The square root of 1275638 is about 1129.4414548794. The cubic root of 1275638 is about 108.4532279451.

It can be divided in two parts, 1275 and 638, that multiplied together give a triangular number (813450 = T₁₂₇₅).

The spelling of 1275638 in words is "one million, two hundred seventy-five thousand, six hundred thirty-eight".