16409401 has 4 divisors (see below), whose sum is σ = 16447732. Its totient is φ = 16371072.

The previous prime is 16409387. The next prime is 16409411. The reversal of 16409401 is 10490461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10490461 = 23 ⋅456107.

It can be written as a sum of positive squares in 2 ways, for example, as 767376 + 15642025 = 876^2 + 3955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16409401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16409411) 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, 18516 + ... + 19381.

It is an arithmetic number, because the mean of its divisors is an integer number (4111933).

Almost surely, 2^16409401 is an apocalyptic number.

It is an amenable number.

16409401 is a deficient number, since it is larger than the sum of its proper divisors (38331).

16409401 is an equidigital number, since it uses as much as digits as its factorization.

16409401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38330.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 16409401 is about 4050.8518857149. The cubic root of 16409401 is about 254.1153556667.

Adding to 16409401 its reverse (10490461), we get a palindrome (26899862).

The spelling of 16409401 in words is "sixteen million, four hundred nine thousand, four hundred one".