3646921987 has 2 divisors, whose sum is σ = 3646921988. Its totient is φ = 3646921986.

The previous prime is 3646921979. The next prime is 3646922051. The reversal of 3646921987 is 7891296463.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3646921987 - 2³ = 3646921979 is a prime.

It is not a weakly prime, because it can be changed into another prime (3646921937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1823460993 + 1823460994.

It is an arithmetic number, because the mean of its divisors is an integer number (1823460994).

Almost surely, 2^3646921987 is an apocalyptic number.

3646921987 is a deficient number, since it is larger than the sum of its proper divisors (1).

3646921987 is an equidigital number, since it uses as much as digits as its factorization.

3646921987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 55.

The square root of 3646921987 is about 60389.7506784057. The cubic root of 3646921987 is about 1539.2488025481.

The spelling of 3646921987 in words is "three billion, six hundred forty-six million, nine hundred twenty-one thousand, nine hundred eighty-seven".