1685038090 has 64 divisors (see below), whose sum is σ = 3210526368. Its totient is φ = 635904000.

The previous prime is 1685038067. The next prime is 1685038109. The reversal of 1685038090 is 908305861.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 294568569 + 1390469521 = 17163^2 + 37289^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4201890 + ... + 4202290.

Almost surely, 2^1685038090 is an apocalyptic number.

1685038090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1685038090 is a deficient number, since it is larger than the sum of its proper divisors (1525488278).

1685038090 is a wasteful number, since it uses less digits than its factorization.

1685038090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 1685038090 is about 41049.2154614434. The cubic root of 1685038090 is about 1189.9715385232.

The spelling of 1685038090 in words is "one billion, six hundred eighty-five million, thirty-eight thousand, ninety".