366428821 has 4 divisors (see below), whose sum is σ = 399740544. Its totient is φ = 333117100.

The previous prime is 366428819. The next prime is 366428827. The reversal of 366428821 is 128824663.

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 366428821 - 2¹ = 366428819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (366428827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16655845 + ... + 16655866.

It is an arithmetic number, because the mean of its divisors is an integer number (99935136).

Almost surely, 2^366428821 is an apocalyptic number.

It is an amenable number.

366428821 is a deficient number, since it is larger than the sum of its proper divisors (33311723).

366428821 is a wasteful number, since it uses less digits than its factorization.

366428821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33311722.

The product of its digits is 110592, while the sum is 40.

The square root of 366428821 is about 19142.3306052320. The cubic root of 366428821 is about 715.5882625153.

The spelling of 366428821 in words is "three hundred sixty-six million, four hundred twenty-eight thousand, eight hundred twenty-one".