1938000878641 has 9 divisors (see below), whose sum is σ = 2025958776121. Its totient is φ = 1853709344212.

The previous prime is 1938000878623. The next prime is 1938000878659. The reversal of 1938000878641 is 1468780008391.

The square root of 1938000878641 is 1392121.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (1938000878623) and next prime (1938000878659).

It is not a de Polignac number, because 1938000878641 - 2¹¹ = 1938000876593 is a prime.

It is a super-2 number, since 2×1938000878641² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1938000818641) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 31988520 + ... + 32049046.

Almost surely, 2^{1938000878641} is an apocalyptic number.

1938000878641 is the 1392121-st square number.

1938000878641 is the 696061-st centered octagonal number.

It is an amenable number.

1938000878641 is a deficient number, since it is larger than the sum of its proper divisors (87957897480).

1938000878641 is an frugal number, since it uses more digits than its factorization.

1938000878641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121100 (or 60550 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 55.

The spelling of 1938000878641 in words is "one trillion, nine hundred thirty-eight billion, eight hundred seventy-eight thousand, six hundred forty-one".