1693645138 has 16 divisors (see below), whose sum is σ = 2603737080. Its totient is φ = 825753600.

The previous prime is 1693645127. The next prime is 1693645139. The reversal of 1693645138 is 8315463961.

It can be written as a sum of positive squares in 4 ways, for example, as 706868569 + 986776569 = 26587^2 + 31413^2 .

It is not an unprimeable number, because it can be changed into a prime (1693645139) 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 7 ways as a sum of consecutive naturals, for example, 216658 + ... + 224338.

Almost surely, 2^1693645138 is an apocalyptic number.

1693645138 is a deficient number, since it is larger than the sum of its proper divisors (910091942).

1693645138 is a wasteful number, since it uses less digits than its factorization.

1693645138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10413.

The product of its digits is 466560, while the sum is 46.

The square root of 1693645138 is about 41153.9200805950. The cubic root of 1693645138 is about 1191.9941936454.

It can be divided in two parts, 1693645 and 138, that multiplied together give a triangular number (233723010 = T₂₁₆₂₀).

The spelling of 1693645138 in words is "one billion, six hundred ninety-three million, six hundred forty-five thousand, one hundred thirty-eight".