1690944345 has 24 divisors (see below), whose sum is σ = 3002460552. Its totient is φ = 879840000.

The previous prime is 1690944331. The next prime is 1690944371. The reversal of 1690944345 is 5434490961.

1690944345 is a `hidden beast` number, since 169 + 0 + 9 + 443 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 164557584 + 1526386761 = 12828^2 + 39069^2 .

It is not a de Polignac number, because 1690944345 - 2¹⁰ = 1690943321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1690944345.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 456406 + ... + 460095.

It is an arithmetic number, because the mean of its divisors is an integer number (125102523).

Almost surely, 2^1690944345 is an apocalyptic number.

1690944345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1690944345 is a deficient number, since it is larger than the sum of its proper divisors (1311516207).

1690944345 is a wasteful number, since it uses less digits than its factorization.

1690944345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916553 (or 916550 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 1690944345 is about 41121.0936746580. The cubic root of 1690944345 is about 1191.3602469254.

The spelling of 1690944345 in words is "one billion, six hundred ninety million, nine hundred forty-four thousand, three hundred forty-five".