401640623 has 4 divisors (see below), whose sum is σ = 425266560. Its totient is φ = 378014688.

The previous prime is 401640611. The next prime is 401640637. The reversal of 401640623 is 326046104.

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 401640623 - 2⁴ = 401640607 is a prime.

It is a super-2 number, since 2×401640623² = 322630380087656258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401640592 and 401640601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401600623) 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, 11812943 + ... + 11812976.

It is an arithmetic number, because the mean of its divisors is an integer number (106316640).

Almost surely, 2^401640623 is an apocalyptic number.

401640623 is a deficient number, since it is larger than the sum of its proper divisors (23625937).

401640623 is a wasteful number, since it uses less digits than its factorization.

401640623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23625936.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 401640623 is about 20040.9736040942. The cubic root of 401640623 is about 737.8122767564.

Adding to 401640623 its reverse (326046104), we get a palindrome (727686727).

The spelling of 401640623 in words is "four hundred one million, six hundred forty thousand, six hundred twenty-three".