16812401 has 4 divisors (see below), whose sum is σ = 16882404. Its totient is φ = 16742400.

The previous prime is 16812361. The next prime is 16812403. The reversal of 16812401 is 10421861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10421861 = 19 ⋅548519.

It can be written as a sum of positive squares in 2 ways, for example, as 12816400 + 3996001 = 3580^2 + 1999^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16812401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16812403) 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, 34640 + ... + 35121.

It is an arithmetic number, because the mean of its divisors is an integer number (4220601).

Almost surely, 2^16812401 is an apocalyptic number.

It is an amenable number.

16812401 is a deficient number, since it is larger than the sum of its proper divisors (70003).

16812401 is an equidigital number, since it uses as much as digits as its factorization.

16812401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70002.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 16812401 is about 4100.2927944233. The cubic root of 16812401 is about 256.1788352055.

It can be divided in two parts, 1681 and 2401, that multiplied together give a square (4036081 = 2009²).

The spelling of 16812401 in words is "sixteen million, eight hundred twelve thousand, four hundred one".