401768639 has 4 divisors (see below), whose sum is σ = 415622760. Its totient is φ = 387914520.

The previous prime is 401768621. The next prime is 401768663. The reversal of 401768639 is 936867104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401768639 - 2⁸ = 401768383 is a prime.

It is a super-2 number, since 2×401768639² = 322836078567824642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 401768639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401768239) 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 3 ways as a sum of consecutive naturals, for example, 6927017 + ... + 6927074.

It is an arithmetic number, because the mean of its divisors is an integer number (103905690).

Almost surely, 2^401768639 is an apocalyptic number.

401768639 is a deficient number, since it is larger than the sum of its proper divisors (13854121).

401768639 is a wasteful number, since it uses less digits than its factorization.

401768639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13854120.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 401768639 is about 20044.1672064469. The cubic root of 401768639 is about 737.8906567292.

The spelling of 401768639 in words is "four hundred one million, seven hundred sixty-eight thousand, six hundred thirty-nine".