1638852040 has 48 divisors (see below), whose sum is σ = 4289449500. Its totient is φ = 561891456.

The previous prime is 1638852023. The next prime is 1638852053. The reversal of 1638852040 is 402588361.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1593127396 + 45724644 = 39914^2 + 6762^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 416115 + ... + 420034.

Almost surely, 2^1638852040 is an apocalyptic number.

1638852040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1638852040 is an abundant number, since it is smaller than the sum of its proper divisors (2650597460).

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

1638852040 is a wasteful number, since it uses less digits than its factorization.

1638852040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836174 (or 836163 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 1638852040 is about 40482.7375556545. The cubic root of 1638852040 is about 1178.9984894911.

The spelling of 1638852040 in words is "one billion, six hundred thirty-eight million, eight hundred fifty-two thousand, forty".