1690387457 has 8 divisors (see below), whose sum is σ = 1844784480. Its totient is φ = 1536111360.

The previous prime is 1690387429. The next prime is 1690387547. The reversal of 1690387457 is 7547830961.

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 1690387457 - 2²⁰ = 1689338881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1690387357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353 + ... + 58145.

It is an arithmetic number, because the mean of its divisors is an integer number (230598060).

Almost surely, 2^1690387457 is an apocalyptic number.

It is an amenable number.

1690387457 is a deficient number, since it is larger than the sum of its proper divisors (154397023).

1690387457 is a wasteful number, since it uses less digits than its factorization.

1690387457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60463.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The square root of 1690387457 is about 41114.3217991006. The cubic root of 1690387457 is about 1191.2294468248.

The spelling of 1690387457 in words is "one billion, six hundred ninety million, three hundred eighty-seven thousand, four hundred fifty-seven".