1938397469 has 2 divisors, whose sum is σ = 1938397470. Its totient is φ = 1938397468.

The previous prime is 1938397459. The next prime is 1938397501. The reversal of 1938397469 is 9647938391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1116428569 + 821968900 = 33413^2 + 28670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1938397469 - 2⁸ = 1938397213 is a prime.

It is a super-2 number, since 2×1938397469² = 7514769495651211922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1938397459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969198734 + 969198735.

It is an arithmetic number, because the mean of its divisors is an integer number (969198735).

Almost surely, 2^1938397469 is an apocalyptic number.

It is an amenable number.

1938397469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938397469 is an equidigital number, since it uses as much as digits as its factorization.

1938397469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 59.

The square root of 1938397469 is about 44027.2355366539. The cubic root of 1938397469 is about 1246.8501963764.

The spelling of 1938397469 in words is "one billion, nine hundred thirty-eight million, three hundred ninety-seven thousand, four hundred sixty-nine".