366978721 has 4 divisors (see below), whose sum is σ = 367328944. Its totient is φ = 366628500.

The previous prime is 366978719. The next prime is 366978737. The reversal of 366978721 is 127879663.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 366978721 - 2¹ = 366978719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (366978791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173535 + ... + 175636.

It is an arithmetic number, because the mean of its divisors is an integer number (91832236).

Almost surely, 2^366978721 is an apocalyptic number.

It is an amenable number.

366978721 is a deficient number, since it is larger than the sum of its proper divisors (350223).

366978721 is a wasteful number, since it uses less digits than its factorization.

366978721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350222.

The product of its digits is 762048, while the sum is 49.

The square root of 366978721 is about 19156.6886752382. The cubic root of 366978721 is about 715.9460448767.

The spelling of 366978721 in words is "three hundred sixty-six million, nine hundred seventy-eight thousand, seven hundred twenty-one".