1938207397 has 12 divisors (see below), whose sum is σ = 2258338860. Its totient is φ = 1658602176.

The previous prime is 1938207377. The next prime is 1938207433. The reversal of 1938207397 is 7937028391.

It can be written as a sum of positive squares in 2 ways, for example, as 1058135841 + 880071556 = 32529^2 + 29666^2 .

It is not a de Polignac number, because 1938207397 - 2²⁷ = 1803989669 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1938207397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938207367) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1822 + ... + 62287.

It is an arithmetic number, because the mean of its divisors is an integer number (188194905).

Almost surely, 2^1938207397 is an apocalyptic number.

It is an amenable number.

1938207397 is a deficient number, since it is larger than the sum of its proper divisors (320131463).

1938207397 is an equidigital number, since it uses as much as digits as its factorization.

1938207397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64740 (or 64733 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 1938207397 is about 44025.0769107789. The cubic root of 1938207397 is about 1246.8094412232.

The spelling of 1938207397 in words is "one billion, nine hundred thirty-eight million, two hundred seven thousand, three hundred ninety-seven".