401688726 has 16 divisors (see below), whose sum is σ = 822972528. Its totient is φ = 130630400.

The previous prime is 401688719. The next prime is 401688751. The reversal of 401688726 is 627886104.

It is a super-2 number, since 2×401688726² = 322707665191006152, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 816195 + ... + 816686.

It is an arithmetic number, because the mean of its divisors is an integer number (51435783).

Almost surely, 2^401688726 is an apocalyptic number.

401688726 is an abundant number, since it is smaller than the sum of its proper divisors (421283802).

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

401688726 is a wasteful number, since it uses less digits than its factorization.

401688726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632927.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 401688726 is about 20042.1736845084. The cubic root of 401688726 is about 737.8417305892.

The spelling of 401688726 in words is "four hundred one million, six hundred eighty-eight thousand, seven hundred twenty-six".