1654543638 has 64 divisors (see below), whose sum is σ = 4016528640. Its totient is φ = 500688000.

The previous prime is 1654543633. The next prime is 1654543691. The reversal of 1654543638 is 8363454561.

1654543638 is a `hidden beast` number, since 1 + 6 + 5 + 4 + 5 + 4 + 3 + 638 = 666.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1654543593 and 1654543602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1654543633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 578913 + ... + 581763.

It is an arithmetic number, because the mean of its divisors is an integer number (62758260).

Almost surely, 2^1654543638 is an apocalyptic number.

1654543638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1654543638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2008264320).

1654543638 is an abundant number, since it is smaller than the sum of its proper divisors (2361985002).

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

1654543638 is a wasteful number, since it uses less digits than its factorization.

1654543638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3850 (or 3844 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The square root of 1654543638 is about 40676.0818909590. The cubic root of 1654543638 is about 1182.7494152424.

The spelling of 1654543638 in words is "one billion, six hundred fifty-four million, five hundred forty-three thousand, six hundred thirty-eight".