1938870961 has 4 divisors (see below), whose sum is σ = 2052922212. Its totient is φ = 1824819712.

The previous prime is 1938870959. The next prime is 1938870971. The reversal of 1938870961 is 1690788391.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 839550625 + 1099320336 = 28975^2 + 33156^2 .

It is not a de Polignac number, because 1938870961 - 2¹ = 1938870959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1938870899 and 1938870908.

It is not an unprimeable number, because it can be changed into a prime (1938870971) 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, 57025600 + ... + 57025633.

It is an arithmetic number, because the mean of its divisors is an integer number (513230553).

Almost surely, 2^1938870961 is an apocalyptic number.

It is an amenable number.

1938870961 is a deficient number, since it is larger than the sum of its proper divisors (114051251).

1938870961 is a wasteful number, since it uses less digits than its factorization.

1938870961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114051250.

The product of its (nonzero) digits is 653184, while the sum is 52.

The square root of 1938870961 is about 44032.6124707585. The cubic root of 1938870961 is about 1246.9517107354.

The spelling of 1938870961 in words is "one billion, nine hundred thirty-eight million, eight hundred seventy thousand, nine hundred sixty-one".