1246645 has 4 divisors (see below), whose sum is σ = 1495980. Its totient is φ = 997312.

The previous prime is 1246639. The next prime is 1246667. The reversal of 1246645 is 5466421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5466421 = 1549 ⋅3529.

It can be written as a sum of positive squares in 2 ways, for example, as 617796 + 628849 = 786^2 + 793^2 .

It is a cyclic number.

It is not a de Polignac number, because 1246645 - 2⁷ = 1246517 is a prime.

1246645 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124660 + ... + 124669.

It is an arithmetic number, because the mean of its divisors is an integer number (373995).

2^1246645 is an apocalyptic number.

It is an amenable number.

1246645 is a deficient number, since it is larger than the sum of its proper divisors (249335).

1246645 is an equidigital number, since it uses as much as digits as its factorization.

1246645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249334.

The product of its digits is 5760, while the sum is 28.

The square root of 1246645 is about 1116.5325790142. The cubic root of 1246645 is about 107.6252731041.

It can be divided in two parts, 1246 and 645, that added together give a triangular number (1891 = T₆₁).

The spelling of 1246645 in words is "one million, two hundred forty-six thousand, six hundred forty-five".