16420901 has 4 divisors (see below), whose sum is σ = 18766752. Its totient is φ = 14075052.

The previous prime is 16420897. The next prime is 16420913. The reversal of 16420901 is 10902461.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10902461 = 229 ⋅47609.

It is a cyclic number.

It is not a de Polignac number, because 16420901 - 2² = 16420897 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16420961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1172915 + ... + 1172928.

It is an arithmetic number, because the mean of its divisors is an integer number (4691688).

Almost surely, 2^16420901 is an apocalyptic number.

It is an amenable number.

16420901 is a deficient number, since it is larger than the sum of its proper divisors (2345851).

16420901 is an equidigital number, since it uses as much as digits as its factorization.

16420901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345850.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 16420901 is about 4052.2710916226. The cubic root of 16420901 is about 254.1747046579.

The spelling of 16420901 in words is "sixteen million, four hundred twenty thousand, nine hundred one".