401978938 has 8 divisors (see below), whose sum is σ = 603094932. Its totient is φ = 200947296.

The previous prime is 401978917. The next prime is 401979013. The reversal of 401978938 is 839879104.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 381303729 + 20675209 = 19527^2 + 4547^2 .

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 = 401978891 and 401978900.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7395 + ... + 29302.

Almost surely, 2^401978938 is an apocalyptic number.

401978938 is a deficient number, since it is larger than the sum of its proper divisors (201115994).

401978938 is a wasteful number, since it uses less digits than its factorization.

401978938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42176.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 401978938 is about 20049.4124103426. The cubic root of 401978938 is about 738.0193797346.

The spelling of 401978938 in words is "four hundred one million, nine hundred seventy-eight thousand, nine hundred thirty-eight".