1938397505 has 16 divisors (see below), whose sum is σ = 2580552000. Its totient is φ = 1385847360.

The previous prime is 1938397501. The next prime is 1938397523. The reversal of 1938397505 is 5057938391.

It is not a de Polignac number, because 1938397505 - 2² = 1938397501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1938397501) 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, 295430 + ... + 301919.

It is an arithmetic number, because the mean of its divisors is an integer number (161284500).

Almost surely, 2^1938397505 is an apocalyptic number.

It is an amenable number.

1938397505 is a deficient number, since it is larger than the sum of its proper divisors (642154495).

1938397505 is a wasteful number, since it uses less digits than its factorization.

1938397505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597424.

The product of its (nonzero) digits is 1020600, while the sum is 50.

The square root of 1938397505 is about 44027.2359454917. The cubic root of 1938397505 is about 1246.8502040952.

The spelling of 1938397505 in words is "one billion, nine hundred thirty-eight million, three hundred ninety-seven thousand, five hundred five".