1820704138 has 32 divisors (see below), whose sum is σ = 3079181952. Its totient is φ = 800217600.

The previous prime is 1820704111. The next prime is 1820704147. The reversal of 1820704138 is 8314070281.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92995 + ... + 110857.

It is an arithmetic number, because the mean of its divisors is an integer number (96224436).

Almost surely, 2^1820704138 is an apocalyptic number.

1820704138 is a deficient number, since it is larger than the sum of its proper divisors (1258477814).

1820704138 is a wasteful number, since it uses less digits than its factorization.

1820704138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18030.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 1820704138 is about 42669.7098419945. The cubic root of 1820704138 is about 1221.0865841357.

The spelling of 1820704138 in words is "one billion, eight hundred twenty million, seven hundred four thousand, one hundred thirty-eight".