401978502 has 24 divisors (see below), whose sum is σ = 871510536. Its totient is φ = 133907136.

The previous prime is 401978501. The next prime is 401978509. The reversal of 401978502 is 205879104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401978501) 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 11 ways as a sum of consecutive naturals, for example, 25918 + ... + 38414.

It is an arithmetic number, because the mean of its divisors is an integer number (36312939).

Almost surely, 2^401978502 is an apocalyptic number.

401978502 is an abundant number, since it is smaller than the sum of its proper divisors (469532034).

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

401978502 is a wasteful number, since it uses less digits than its factorization.

401978502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14292 (or 14289 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 401978502 is about 20049.4015372030. The cubic root of 401978502 is about 738.0191129075.

The spelling of 401978502 in words is "four hundred one million, nine hundred seventy-eight thousand, five hundred two".