401999623 has 2 divisors, whose sum is σ = 401999624. Its totient is φ = 401999622.

The previous prime is 401999617. The next prime is 401999641. The reversal of 401999623 is 326999104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401999623 - 2⁹ = 401999111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 401999623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401990623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200999811 + 200999812.

It is an arithmetic number, because the mean of its divisors is an integer number (200999812).

Almost surely, 2^401999623 is an apocalyptic number.

401999623 is a deficient number, since it is larger than the sum of its proper divisors (1).

401999623 is an equidigital number, since it uses as much as digits as its factorization.

401999623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 401999623 is about 20049.9282542357. The cubic root of 401999623 is about 738.0320384982.

The spelling of 401999623 in words is "four hundred one million, nine hundred ninety-nine thousand, six hundred twenty-three".