1690506394 has 16 divisors (see below), whose sum is σ = 2717526528. Its totient is φ = 786650832.

The previous prime is 1690506341. The next prime is 1690506407. The reversal of 1690506394 is 4936050961.

It is a self number, because there is not a number n which added to its sum of digits gives 1690506394.

It is an unprimeable number.

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, 494922 + ... + 498325.

It is an arithmetic number, because the mean of its divisors is an integer number (169845408).

Almost surely, 2^1690506394 is an apocalyptic number.

1690506394 is a deficient number, since it is larger than the sum of its proper divisors (1027020134).

1690506394 is a wasteful number, since it uses less digits than its factorization.

1690506394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993309.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 1690506394 is about 41115.7681917777. The cubic root of 1690506394 is about 1191.2573847852.

The spelling of 1690506394 in words is "one billion, six hundred ninety million, five hundred six thousand, three hundred ninety-four".