1638674120 has 16 divisors (see below), whose sum is σ = 3687016860. Its totient is φ = 655469632.

The previous prime is 1638674113. The next prime is 1638674131. The reversal of 1638674120 is 214768361.

It can be written as a sum of positive squares in 2 ways, for example, as 1635555364 + 3118756 = 40442^2 + 1766^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20483387 + ... + 20483466.

Almost surely, 2^1638674120 is an apocalyptic number.

1638674120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1638674120 is an abundant number, since it is smaller than the sum of its proper divisors (2048342740).

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

1638674120 is a wasteful number, since it uses less digits than its factorization.

1638674120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40966864 (or 40966860 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 1638674120 is about 40480.5400161609. The cubic root of 1638674120 is about 1178.9558224295.

The spelling of 1638674120 in words is "one billion, six hundred thirty-eight million, six hundred seventy-four thousand, one hundred twenty".