1940690709 has 12 divisors (see below), whose sum is σ = 2968115436. Its totient is φ = 1217688192.

The previous prime is 1940690707. The next prime is 1940690729. The reversal of 1940690709 is 9070960491.

It can be written as a sum of positive squares in 2 ways, for example, as 1451838609 + 488852100 = 38103^2 + 22110^2 .

It is not a de Polignac number, because 1940690709 - 2¹ = 1940690707 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1940690707) 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 11 ways as a sum of consecutive naturals, for example, 6341974 + ... + 6342279.

It is an arithmetic number, because the mean of its divisors is an integer number (247342953).

Almost surely, 2^1940690709 is an apocalyptic number.

It is an amenable number.

1940690709 is a deficient number, since it is larger than the sum of its proper divisors (1027424727).

1940690709 is a wasteful number, since it uses less digits than its factorization.

1940690709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12684276 (or 12684273 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 1940690709 is about 44053.2712633239. The cubic root of 1940690709 is about 1247.3417020223.

The spelling of 1940690709 in words is "one billion, nine hundred forty million, six hundred ninety thousand, seven hundred nine".