1638934742 has 8 divisors (see below), whose sum is σ = 2603014056. Its totient is φ = 771263392.

The previous prime is 1638934679. The next prime is 1638934751. The reversal of 1638934742 is 2474398361.

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

It is a super-2 number, since 2×1638934742² = 5372214177069213128, which contains 22 as substring.

It is a congruent number.

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, 24101948 + ... + 24102015.

It is an arithmetic number, because the mean of its divisors is an integer number (325376757).

Almost surely, 2^1638934742 is an apocalyptic number.

1638934742 is a deficient number, since it is larger than the sum of its proper divisors (964079314).

1638934742 is a wasteful number, since it uses less digits than its factorization.

1638934742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48203982.

The product of its digits is 870912, while the sum is 47.

The square root of 1638934742 is about 40483.7589904890. The cubic root of 1638934742 is about 1179.0183212372.

The spelling of 1638934742 in words is "one billion, six hundred thirty-eight million, nine hundred thirty-four thousand, seven hundred forty-two".