1405636 has 12 divisors (see below), whose sum is σ = 2480128. Its totient is φ = 697032.

The previous prime is 1405631. The next prime is 1405637. The reversal of 1405636 is 6365041.

It is a self number, because there is not a number n which added to its sum of digits gives 1405636.

It is not an unprimeable number, because it can be changed into a prime (1405631) 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, 876 + ... + 1891.

2^1405636 is an apocalyptic number.

It is an amenable number.

1405636 is a deficient number, since it is larger than the sum of its proper divisors (1074492).

1405636 is a wasteful number, since it uses less digits than its factorization.

1405636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2898 (or 2896 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1405636 is about 1185.5952091671. The cubic root of 1405636 is about 112.0188106161.

It can be divided in two parts, 140 and 5636, that added together give a square (5776 = 76²).

The spelling of 1405636 in words is "one million, four hundred five thousand, six hundred thirty-six".