1641449638 has 4 divisors (see below), whose sum is σ = 2462174460. Its totient is φ = 820724818.

The previous prime is 1641449587. The next prime is 1641449651. The reversal of 1641449638 is 8369441461.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410362408 + ... + 410362411.

It is an arithmetic number, because the mean of its divisors is an integer number (615543615).

Almost surely, 2^1641449638 is an apocalyptic number.

1641449638 is a deficient number, since it is larger than the sum of its proper divisors (820724822).

1641449638 is an equidigital number, since it uses as much as digits as its factorization.

1641449638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820724821.

The product of its digits is 497664, while the sum is 46.

The square root of 1641449638 is about 40514.8076386893. The cubic root of 1641449638 is about 1179.6210690775.

The spelling of 1641449638 in words is "one billion, six hundred forty-one million, four hundred forty-nine thousand, six hundred thirty-eight".