3742921638 has 24 divisors (see below), whose sum is σ = 8116742088. Its totient is φ = 1246551552.

The previous prime is 3742921607. The next prime is 3742921643. The reversal of 3742921638 is 8361292473.

3742921638 is a `hidden beast` number, since 3 + 7 + 4 + 2 + 9 + 2 + 1 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 3742921593 and 3742921602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69420 + ... + 110927.

It is an arithmetic number, because the mean of its divisors is an integer number (338197587).

Almost surely, 2^3742921638 is an apocalyptic number.

3742921638 is an abundant number, since it is smaller than the sum of its proper divisors (4373820450).

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

3742921638 is a wasteful number, since it uses less digits than its factorization.

3742921638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181508 (or 181505 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 3742921638 is about 61179.4216873615. The cubic root of 3742921638 is about 1552.6381210012.

The spelling of 3742921638 in words is "three billion, seven hundred forty-two million, nine hundred twenty-one thousand, six hundred thirty-eight".