1938914465 has 4 divisors (see below), whose sum is σ = 2326697364. Its totient is φ = 1551131568.

The previous prime is 1938914399. The next prime is 1938914519. The reversal of 1938914465 is 5644198391.

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 1502647696 + 436266769 = 38764^2 + 20887^2 .

It is a cyclic number.

It is not a de Polignac number, because 1938914465 - 2¹⁰ = 1938913441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193891442 + ... + 193891451.

It is an arithmetic number, because the mean of its divisors is an integer number (581674341).

Almost surely, 2^1938914465 is an apocalyptic number.

It is an amenable number.

1938914465 is a deficient number, since it is larger than the sum of its proper divisors (387782899).

1938914465 is an equidigital number, since it uses as much as digits as its factorization.

1938914465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387782898.

The product of its digits is 933120, while the sum is 50.

The square root of 1938914465 is about 44033.1064654766. The cubic root of 1938914465 is about 1246.9610369502.

The spelling of 1938914465 in words is "one billion, nine hundred thirty-eight million, nine hundred fourteen thousand, four hundred sixty-five".