1939380697 has 4 divisors (see below), whose sum is σ = 1939469476. Its totient is φ = 1939291920.

The previous prime is 1939380679. The next prime is 1939380719. The reversal of 1939380697 is 7960839391.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7960839391 = 593 ⋅13424687.

It can be written as a sum of positive squares in 2 ways, for example, as 833419161 + 1105961536 = 28869^2 + 33256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1939380697 is a prime.

It is a super-2 number, since 2×1939380697² = 7522394975792411618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1939380607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13843 + ... + 63799.

It is an arithmetic number, because the mean of its divisors is an integer number (484867369).

Almost surely, 2^1939380697 is an apocalyptic number.

It is an amenable number.

1939380697 is a deficient number, since it is larger than the sum of its proper divisors (88779).

1939380697 is an equidigital number, since it uses as much as digits as its factorization.

1939380697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88778.

The product of its (nonzero) digits is 2204496, while the sum is 55.

The square root of 1939380697 is about 44038.4002547776. The cubic root of 1939380697 is about 1247.0609771583.

The spelling of 1939380697 in words is "one billion, nine hundred thirty-nine million, three hundred eighty thousand, six hundred ninety-seven".