1641397638 has 32 divisors (see below), whose sum is σ = 3407639040. Its totient is φ = 526707360.

The previous prime is 1641397619. The next prime is 1641397673. The reversal of 1641397638 is 8367931461.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30508 + ... + 64911.

It is an arithmetic number, because the mean of its divisors is an integer number (106488720).

Almost surely, 2^1641397638 is an apocalyptic number.

1641397638 is an abundant number, since it is smaller than the sum of its proper divisors (1766241402).

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

1641397638 is a wasteful number, since it uses less digits than its factorization.

1641397638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95532.

The product of its digits is 653184, while the sum is 48.

The square root of 1641397638 is about 40514.1658929318. The cubic root of 1641397638 is about 1179.6086124169.

The spelling of 1641397638 in words is "one billion, six hundred forty-one million, three hundred ninety-seven thousand, six hundred thirty-eight".