1640693930 has 8 divisors (see below), whose sum is σ = 2953249092. Its totient is φ = 656277568.

The previous prime is 1640693921. The next prime is 1640693959. The reversal of 1640693930 is 393960461.

It can be written as a sum of positive squares in 2 ways, for example, as 1584278809 + 56415121 = 39803^2 + 7511^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82034687 + ... + 82034706.

Almost surely, 2^1640693930 is an apocalyptic number.

1640693930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640693930 is a deficient number, since it is larger than the sum of its proper divisors (1312555162).

1640693930 is a wasteful number, since it uses less digits than its factorization.

1640693930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164069400.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 1640693930 is about 40505.4802465049. The cubic root of 1640693930 is about 1179.4400124679.

The spelling of 1640693930 in words is "one billion, six hundred forty million, six hundred ninety-three thousand, nine hundred thirty".