396440042 has 8 divisors (see below), whose sum is σ = 597679236. Its totient is φ = 197213632.

The previous prime is 396440041. The next prime is 396440113. The reversal of 396440042 is 240044693.

It can be written as a sum of positive squares in 2 ways, for example, as 321807721 + 74632321 = 17939^2 + 8639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 396439990 and 396440008.

It is not an unprimeable number, because it can be changed into a prime (396440041) 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, 502703 + ... + 503490.

Almost surely, 2^396440042 is an apocalyptic number.

396440042 is a deficient number, since it is larger than the sum of its proper divisors (201239194).

396440042 is a wasteful number, since it uses less digits than its factorization.

396440042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006392.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 396440042 is about 19910.8021435602. The cubic root of 396440042 is about 734.6139500123.

The spelling of 396440042 in words is "three hundred ninety-six million, four hundred forty thousand, forty-two".