1640930794 has 4 divisors (see below), whose sum is σ = 2461396194. Its totient is φ = 820465396.

The previous prime is 1640930779. The next prime is 1640930803. The reversal of 1640930794 is 4970390461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1302849025 + 338081769 = 36095^2 + 18387^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1640930794.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410232697 + ... + 410232700.

Almost surely, 2^1640930794 is an apocalyptic number.

1640930794 is a deficient number, since it is larger than the sum of its proper divisors (820465400).

1640930794 is an equidigital number, since it uses as much as digits as its factorization.

1640930794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820465399.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 1640930794 is about 40508.4039922582. The cubic root of 1640930794 is about 1179.4967676070.

The spelling of 1640930794 in words is "one billion, six hundred forty million, nine hundred thirty thousand, seven hundred ninety-four".