1638955274 has 8 divisors (see below), whose sum is σ = 2681926848. Its totient is φ = 744979660.

The previous prime is 1638955243. The next prime is 1638955291. The reversal of 1638955274 is 4725598361.

It is a happy number.

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

It is an unprimeable number.

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, 37248962 + ... + 37249005.

It is an arithmetic number, because the mean of its divisors is an integer number (335240856).

Almost surely, 2^1638955274 is an apocalyptic number.

1638955274 is a deficient number, since it is larger than the sum of its proper divisors (1042971574).

1638955274 is a wasteful number, since it uses less digits than its factorization.

1638955274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74497980.

The product of its digits is 1814400, while the sum is 50.

The square root of 1638955274 is about 40484.0125728663. The cubic root of 1638955274 is about 1179.0232446594.

The spelling of 1638955274 in words is "one billion, six hundred thirty-eight million, nine hundred fifty-five thousand, two hundred seventy-four".