1803638402 has 8 divisors (see below), whose sum is σ = 2715086412. Its totient is φ = 898609600.

The previous prime is 1803638401. The next prime is 1803638407. The reversal of 1803638402 is 2048363081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1699005961 + 104632441 = 41219^2 + 10229^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1803638402² = 6506222970338227208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1803638401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1604099 + ... + 1605222.

Almost surely, 2^1803638402 is an apocalyptic number.

1803638402 is a deficient number, since it is larger than the sum of its proper divisors (911448010).

1803638402 is a wasteful number, since it uses less digits than its factorization.

1803638402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3209604.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 1803638402 is about 42469.2642036567. The cubic root of 1803638402 is about 1217.2594584575.

The spelling of 1803638402 in words is "one billion, eight hundred three million, six hundred thirty-eight thousand, four hundred two".