1690402189 has 4 divisors (see below), whose sum is σ = 1931888224. Its totient is φ = 1448916156.

The previous prime is 1690402139. The next prime is 1690402211. The reversal of 1690402189 is 9812040961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9812040961 = 59 ⋅166305779.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1690402189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690402139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120743007 + ... + 120743020.

It is an arithmetic number, because the mean of its divisors is an integer number (482972056).

Almost surely, 2^1690402189 is an apocalyptic number.

It is an amenable number.

1690402189 is a deficient number, since it is larger than the sum of its proper divisors (241486035).

1690402189 is an equidigital number, since it uses as much as digits as its factorization.

1690402189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241486034.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1690402189 is about 41114.5009576913. The cubic root of 1690402189 is about 1191.2329074005.

The spelling of 1690402189 in words is "one billion, six hundred ninety million, four hundred two thousand, one hundred eighty-nine".