1693985390 has 16 divisors (see below), whose sum is σ = 3147534720. Its totient is φ = 655736160.

The previous prime is 1693985389. The next prime is 1693985407. The reversal of 1693985390 is 935893961.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2731925 + ... + 2732544.

It is an arithmetic number, because the mean of its divisors is an integer number (196720920).

Almost surely, 2^1693985390 is an apocalyptic number.

1693985390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1693985390 is a deficient number, since it is larger than the sum of its proper divisors (1453549330).

1693985390 is a wasteful number, since it uses less digits than its factorization.

1693985390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5464507.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The square root of 1693985390 is about 41158.0537683696. The cubic root of 1693985390 is about 1192.0740118714.

The spelling of 1693985390 in words is "one billion, six hundred ninety-three million, nine hundred eighty-five thousand, three hundred ninety".