636418 has 4 divisors (see below), whose sum is σ = 954630. Its totient is φ = 318208.

The previous prime is 636409. The next prime is 636421. The reversal of 636418 is 814636.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 628849 + 7569 = 793^2 + 87^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159103 + ... + 159106.

2⁶³⁶⁴¹⁸ is an apocalyptic number.

636418 is a deficient number, since it is larger than the sum of its proper divisors (318212).

636418 is a wasteful number, since it uses less digits than its factorization.

636418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318211.

The product of its digits is 3456, while the sum is 28.

The square root of 636418 is about 797.7581087021. The cubic root of 636418 is about 86.0163120311.

The spelling of 636418 in words is "six hundred thirty-six thousand, four hundred eighteen".