401820678 has 36 divisors (see below), whose sum is σ = 1012754340. Its totient is φ = 114805656.

The previous prime is 401820673. The next prime is 401820701. The reversal of 401820678 is 876028104.

It is a super-2 number, since 2×401820678² = 322919714536759368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401820673) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 226908 + ... + 228671.

It is an arithmetic number, because the mean of its divisors is an integer number (28132065).

Almost surely, 2^401820678 is an apocalyptic number.

401820678 is an abundant number, since it is smaller than the sum of its proper divisors (610933662).

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

401820678 is a wasteful number, since it uses less digits than its factorization.

401820678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455601 (or 455591 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 401820678 is about 20045.4652727244. The cubic root of 401820678 is about 737.9225137321.

The spelling of 401820678 in words is "four hundred one million, eight hundred twenty thousand, six hundred seventy-eight".