1638554046 has 16 divisors (see below), whose sum is σ = 3323265408. Its totient is φ = 538491800.

The previous prime is 1638554041. The next prime is 1638554081. The reversal of 1638554046 is 6404558361.

It is a junction number, because it is equal to n+sod(n) for n = 1638553989 and 1638554007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638554041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1922760 + ... + 1923611.

It is an arithmetic number, because the mean of its divisors is an integer number (207704088).

Almost surely, 2^1638554046 is an apocalyptic number.

1638554046 is an abundant number, since it is smaller than the sum of its proper divisors (1684711362).

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

1638554046 is a wasteful number, since it uses less digits than its factorization.

1638554046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846447.

The product of its (nonzero) digits is 345600, while the sum is 42.

The square root of 1638554046 is about 40479.0568813059. The cubic root of 1638554046 is about 1178.9270256932.

The spelling of 1638554046 in words is "one billion, six hundred thirty-eight million, five hundred fifty-four thousand, forty-six".