1253645 has 8 divisors (see below), whose sum is σ = 1514904. Its totient is φ = 995904.

The previous prime is 1253627. The next prime is 1253683. The reversal of 1253645 is 5463521.

It can be written as a sum of positive squares in 4 ways, for example, as 3721 + 1249924 = 61^2 + 1118^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1253645 - 2²⁰ = 205069 is a prime.

It is a super-3 number, since 3×1253645³ = 5910782425563933375, which contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14 + ... + 1583.

It is an arithmetic number, because the mean of its divisors is an integer number (189363).

2^1253645 is an apocalyptic number.

It is an amenable number.

1253645 is a deficient number, since it is larger than the sum of its proper divisors (261259).

1253645 is a wasteful number, since it uses less digits than its factorization.

1253645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759.

The product of its digits is 3600, while the sum is 26.

The square root of 1253645 is about 1119.6628956967. The cubic root of 1253645 is about 107.8263384183.

It can be divided in two parts, 125 and 3645, that multiplied together give a square (455625 = 675²).

The spelling of 1253645 in words is "one million, two hundred fifty-three thousand, six hundred forty-five".