1205681938 has 4 divisors (see below), whose sum is σ = 1808522910. Its totient is φ = 602840968.

The previous prime is 1205681927. The next prime is 1205682029. The reversal of 1205681938 is 8391865021.

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., 1174912729 + 30769209 = 34277^2 + 5547^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1205681894 and 1205681903.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 301420483 + ... + 301420486.

Almost surely, 2^1205681938 is an apocalyptic number.

1205681938 is a deficient number, since it is larger than the sum of its proper divisors (602840972).

1205681938 is an equidigital number, since it uses as much as digits as its factorization.

1205681938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602840971.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 1205681938 is about 34722.9310110768. The cubic root of 1205681938 is about 1064.3331400951. Note that the first 3 decimals are identical.

The spelling of 1205681938 in words is "one billion, two hundred five million, six hundred eighty-one thousand, nine hundred thirty-eight".