396861630 has 64 divisors (see below), whose sum is σ = 1067171328. Its totient is φ = 93605760.

The previous prime is 396861613. The next prime is 396861637. The reversal of 396861630 is 36168693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396861637) 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 31 ways as a sum of consecutive naturals, for example, 4042 + ... + 28461.

It is an arithmetic number, because the mean of its divisors is an integer number (16674552).

Almost surely, 2^396861630 is an apocalyptic number.

396861630 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 396861630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (533585664).

396861630 is an abundant number, since it is smaller than the sum of its proper divisors (670309698).

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

396861630 is a wasteful number, since it uses less digits than its factorization.

396861630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32561.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 396861630 is about 19921.3862469458. The cubic root of 396861630 is about 734.8742623543.

The spelling of 396861630 in words is "three hundred ninety-six million, eight hundred sixty-one thousand, six hundred thirty".