1551636 has 30 divisors (see below), whose sum is σ = 4057130. Its totient is φ = 517104.

The previous prime is 1551623. The next prime is 1551647. The reversal of 1551636 is 6361551.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 980100 + 571536 = 990^2 + 756^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2071 + ... + 2718.

2^1551636 is an apocalyptic number.

It is an amenable number.

1551636 is an abundant number, since it is smaller than the sum of its proper divisors (2505494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1551636 is a wasteful number, since it uses less digits than its factorization.

1551636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4805 (or 4794 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 1551636 is about 1245.6468199293. The cubic root of 1551636 is about 115.7701552663.

It can be divided in two parts, 1551 and 636, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1551636 in words is "one million, five hundred fifty-one thousand, six hundred thirty-six".