3728689931 has 2 divisors, whose sum is σ = 3728689932. Its totient is φ = 3728689930.

The previous prime is 3728689927. The next prime is 3728689997. The reversal of 3728689931 is 1399868273.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3728689931 - 2² = 3728689927 is a prime.

It is a super-2 number, since 2×3728689931² = 27806257203081569522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3728685931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1864344965 + 1864344966.

It is an arithmetic number, because the mean of its divisors is an integer number (1864344966).

Almost surely, 2^3728689931 is an apocalyptic number.

3728689931 is a deficient number, since it is larger than the sum of its proper divisors (1).

3728689931 is an equidigital number, since it uses as much as digits as its factorization.

3728689931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 56.

The square root of 3728689931 is about 61062.9996888459. Note that the first 3 decimals coincide. The cubic root of 3728689931 is about 1550.6677568187.

The spelling of 3728689931 in words is "three billion, seven hundred twenty-eight million, six hundred eighty-nine thousand, nine hundred thirty-one".