16401403 has 2 divisors, whose sum is σ = 16401404. Its totient is φ = 16401402.

The previous prime is 16401391. The next prime is 16401419. The reversal of 16401403 is 30410461.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16401403 is a prime.

It is not a weakly prime, because it can be changed into another prime (16401493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8200701 + 8200702.

It is an arithmetic number, because the mean of its divisors is an integer number (8200702).

Almost surely, 2^16401403 is an apocalyptic number.

16401403 is a deficient number, since it is larger than the sum of its proper divisors (1).

16401403 is an equidigital number, since it uses as much as digits as its factorization.

16401403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 16401403 is about 4049.8645656367. The cubic root of 16401403 is about 254.0740633834.

Adding to 16401403 its reverse (30410461), we get a palindrome (46811864).

The spelling of 16401403 in words is "sixteen million, four hundred one thousand, four hundred three".