16380649 has 2 divisors, whose sum is σ = 16380650. Its totient is φ = 16380648.

The previous prime is 16380647. The next prime is 16380659. The reversal of 16380649 is 94608361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 59049 = 4040^2 + 243^2 .

It is a cyclic number.

It is not a de Polignac number, because 16380649 - 2¹ = 16380647 is a prime.

It is a super-2 number, since 2×16380649² = 536651323322402, which contains 22 as substring.

Together with 16380647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16380647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8190324 + 8190325.

It is an arithmetic number, because the mean of its divisors is an integer number (8190325).

Almost surely, 2^16380649 is an apocalyptic number.

It is an amenable number.

16380649 is a deficient number, since it is larger than the sum of its proper divisors (1).

16380649 is an equidigital number, since it uses as much as digits as its factorization.

16380649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 16380649 is about 4047.3014466432. The cubic root of 16380649 is about 253.9668514411.

The spelling of 16380649 in words is "sixteen million, three hundred eighty thousand, six hundred forty-nine".