1640081194 has 16 divisors (see below), whose sum is σ = 2568683520. Its totient is φ = 783897840.

The previous prime is 1640081173. The next prime is 1640081207. The reversal of 1640081194 is 4911800461.

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, 69847 + ... + 90325.

It is an arithmetic number, because the mean of its divisors is an integer number (160542720).

Almost surely, 2^1640081194 is an apocalyptic number.

1640081194 is a deficient number, since it is larger than the sum of its proper divisors (928602326).

1640081194 is a wasteful number, since it uses less digits than its factorization.

1640081194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22245.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 1640081194 is about 40497.9159216866. The cubic root of 1640081194 is about 1179.2931690448.

The spelling of 1640081194 in words is "one billion, six hundred forty million, eighty-one thousand, one hundred ninety-four".