16403401 has 4 divisors (see below), whose sum is σ = 18746752. Its totient is φ = 14060052.

The previous prime is 16403389. The next prime is 16403417. The reversal of 16403401 is 10430461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16403401 - 2⁵ = 16403369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16403461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1171665 + ... + 1171678.

It is an arithmetic number, because the mean of its divisors is an integer number (4686688).

Almost surely, 2^16403401 is an apocalyptic number.

It is an amenable number.

16403401 is a deficient number, since it is larger than the sum of its proper divisors (2343351).

16403401 is an equidigital number, since it uses as much as digits as its factorization.

16403401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343350.

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

The square root of 16403401 is about 4050.1112330404. Note that the first 3 decimals coincide. The cubic root of 16403401 is about 254.0843799676.

Adding to 16403401 its reverse (10430461), we get a palindrome (26833862).

It can be divided in two parts, 1640 and 3401, that added together give a square (5041 = 71²).

The spelling of 16403401 in words is "sixteen million, four hundred three thousand, four hundred one".