401680042 has 8 divisors (see below), whose sum is σ = 608048100. Its totient is φ = 198997344.

The previous prime is 401680021. The next prime is 401680043. The reversal of 401680042 is 240086104.

It can be written as a sum of positive squares in 2 ways, for example, as 400760361 + 919681 = 20019^2 + 959^2 .

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

It is a super-2 number, since 2×401680042² = 322693712282243528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401679989 and 401680016.

It is not an unprimeable number, because it can be changed into a prime (401680043) 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, 921067 + ... + 921502.

Almost surely, 2^401680042 is an apocalyptic number.

401680042 is a deficient number, since it is larger than the sum of its proper divisors (206368058).

401680042 is a wasteful number, since it uses less digits than its factorization.

401680042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842680.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 401680042 is about 20041.9570401695. The cubic root of 401680042 is about 737.8364134839.

The spelling of 401680042 in words is "four hundred one million, six hundred eighty thousand, forty-two".