400001603 has 2 divisors, whose sum is σ = 400001604. Its totient is φ = 400001602.

The previous prime is 400001543. The next prime is 400001621. The reversal of 400001603 is 306100004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400001603 - 2²⁶ = 332892739 is a prime.

It is not a weakly prime, because it can be changed into another prime (400001663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200000801 + 200000802.

It is an arithmetic number, because the mean of its divisors is an integer number (200000802).

Almost surely, 2^400001603 is an apocalyptic number.

400001603 is a deficient number, since it is larger than the sum of its proper divisors (1).

400001603 is an equidigital number, since it uses as much as digits as its factorization.

400001603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 400001603 is about 20000.0400749598. The cubic root of 400001603 is about 736.8072839772.

Adding to 400001603 its reverse (306100004), we get a palindrome (706101607).

The spelling of 400001603 in words is "four hundred million, one thousand, six hundred three".