396021420 has 48 divisors (see below), whose sum is σ = 1232068320. Its totient is φ = 105605568.

The previous prime is 396021413. The next prime is 396021421. The reversal of 396021420 is 24120693.

396021420 is a `hidden beast` number, since 39 + 602 + 1 + 4 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (396021421) 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 15 ways as a sum of consecutive naturals, for example, 366147 + ... + 367226.

It is an arithmetic number, because the mean of its divisors is an integer number (25668090).

Almost surely, 2^396021420 is an apocalyptic number.

396021420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

396021420 is an abundant number, since it is smaller than the sum of its proper divisors (836046900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

396021420 is a wasteful number, since it uses less digits than its factorization.

396021420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733391 (or 733383 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 396021420 is about 19900.2869326048. The cubic root of 396021420 is about 734.3552863759.

The spelling of 396021420 in words is "three hundred ninety-six million, twenty-one thousand, four hundred twenty".