400001623 has 8 divisors (see below), whose sum is σ = 481205120. Its totient is φ = 324813240.

The previous prime is 400001621. The next prime is 400001639. The reversal of 400001623 is 326100004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400001623 - 2¹ = 400001621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400001597 and 400001606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400001621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1503633 + ... + 1503898.

It is an arithmetic number, because the mean of its divisors is an integer number (60150640).

Almost surely, 2^400001623 is an apocalyptic number.

400001623 is a deficient number, since it is larger than the sum of its proper divisors (81203497).

400001623 is a wasteful number, since it uses less digits than its factorization.

400001623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3007557.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 400001623 is about 20000.0405749588. The cubic root of 400001623 is about 736.8072962572.

Adding to 400001623 its reverse (326100004), we get a palindrome (726101627).

The spelling of 400001623 in words is "four hundred million, one thousand, six hundred twenty-three".