396450221 has 4 divisors (see below), whose sum is σ = 398329344. Its totient is φ = 394571100.

The previous prime is 396450211. The next prime is 396450253. The reversal of 396450221 is 122054693.

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 396450221 - 2⁶ = 396450157 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 (396450211) 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, 939245 + ... + 939666.

It is an arithmetic number, because the mean of its divisors is an integer number (99582336).

Almost surely, 2^396450221 is an apocalyptic number.

It is an amenable number.

396450221 is a deficient number, since it is larger than the sum of its proper divisors (1879123).

396450221 is a wasteful number, since it uses less digits than its factorization.

396450221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879122.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 396450221 is about 19911.0577569350. The cubic root of 396450221 is about 734.6202372778.

The spelling of 396450221 in words is "three hundred ninety-six million, four hundred fifty thousand, two hundred twenty-one".