1638495548 has 12 divisors (see below), whose sum is σ = 2870420952. Its totient is φ = 818375280.

The previous prime is 1638495541. The next prime is 1638495557. The reversal of 1638495548 is 8455948361.

It is a self number, because there is not a number n which added to its sum of digits gives 1638495548.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638495541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213890 + ... + 221417.

It is an arithmetic number, because the mean of its divisors is an integer number (239201746).

Almost surely, 2^1638495548 is an apocalyptic number.

It is an amenable number.

1638495548 is a deficient number, since it is larger than the sum of its proper divisors (1231925404).

1638495548 is a wasteful number, since it uses less digits than its factorization.

1638495548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436252 (or 436250 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 53.

The square root of 1638495548 is about 40478.3343036741. The cubic root of 1638495548 is about 1178.9129959060.

The spelling of 1638495548 in words is "one billion, six hundred thirty-eight million, four hundred ninety-five thousand, five hundred forty-eight".