1690408217 has 8 divisors (see below), whose sum is σ = 1730948736. Its totient is φ = 1649923632.

The previous prime is 1690408201. The next prime is 1690408219. The reversal of 1690408217 is 7128040961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1690408217 - 2⁴ = 1690408201 is a prime.

It is a super-2 number, since 2×1690408217² = 5714959880202238178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1690408219) 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 7 ways as a sum of consecutive naturals, for example, 50723 + ... + 77159.

It is an arithmetic number, because the mean of its divisors is an integer number (216368592).

Almost surely, 2^1690408217 is an apocalyptic number.

It is an amenable number.

1690408217 is a deficient number, since it is larger than the sum of its proper divisors (40540519).

1690408217 is a wasteful number, since it uses less digits than its factorization.

1690408217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27967.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 1690408217 is about 41114.5742650949. The cubic root of 1690408217 is about 1191.2343233837.

The spelling of 1690408217 in words is "one billion, six hundred ninety million, four hundred eight thousand, two hundred seventeen".