436420638 has 24 divisors (see below), whose sum is σ = 946593648. Its totient is φ = 145317312.

The previous prime is 436420637. The next prime is 436420679. The reversal of 436420638 is 836024634.

It is a happy number.

436420638 is a `hidden beast` number, since 4 + 3 + 642 + 0 + 6 + 3 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (436420637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4870 + ... + 29942.

It is an arithmetic number, because the mean of its divisors is an integer number (39441402).

Almost surely, 2^436420638 is an apocalyptic number.

436420638 is an abundant number, since it is smaller than the sum of its proper divisors (510173010).

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

436420638 is a wasteful number, since it uses less digits than its factorization.

436420638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26048 (or 26045 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 436420638 is about 20890.6830429261. The cubic root of 436420638 is about 758.5224281437.

The spelling of 436420638 in words is "four hundred thirty-six million, four hundred twenty thousand, six hundred thirty-eight".