1938410661 has 16 divisors (see below), whose sum is σ = 2820280320. Its totient is φ = 1174471920.

The previous prime is 1938410659. The next prime is 1938410681. The reversal of 1938410661 is 1660148391.

1938410661 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1938410661 - 2¹ = 1938410659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938410641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178300 + ... + 188858.

It is an arithmetic number, because the mean of its divisors is an integer number (176267520).

Almost surely, 2^1938410661 is an apocalyptic number.

1938410661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1938410661 is a deficient number, since it is larger than the sum of its proper divisors (881869659).

1938410661 is a wasteful number, since it uses less digits than its factorization.

1938410661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16136.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 1938410661 is about 44027.3853527552. The cubic root of 1938410661 is about 1246.8530249002.

The spelling of 1938410661 in words is "one billion, nine hundred thirty-eight million, four hundred ten thousand, six hundred sixty-one".