1690408199 has 4 divisors (see below), whose sum is σ = 1693193664. Its totient is φ = 1687622736.

The previous prime is 1690408193. The next prime is 1690408201. The reversal of 1690408199 is 9918040961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9918040961 = 1109 ⋅8943229.

It is a cyclic number.

It is not a de Polignac number, because 1690408199 - 2¹⁶ = 1690342663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690408193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1391822 + ... + 1393035.

It is an arithmetic number, because the mean of its divisors is an integer number (423298416).

Almost surely, 2^1690408199 is an apocalyptic number.

1690408199 is a deficient number, since it is larger than the sum of its proper divisors (2785465).

1690408199 is an equidigital number, since it uses as much as digits as its factorization.

1690408199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785464.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 1690408199 is about 41114.5740461944. The cubic root of 1690408199 is about 1191.2343191555.

The spelling of 1690408199 in words is "one billion, six hundred ninety million, four hundred eight thousand, one hundred ninety-nine".