13673621 has 6 divisors (see below), whose sum is σ = 14806530. Its totient is φ = 12621648.

The previous prime is 13673603. The next prime is 13673651. The reversal of 13673621 is 12637631.

It can be written as a sum of positive squares in 3 ways, for example, as 87025 + 13586596 = 295^2 + 3686^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13673621 is a prime.

It is a super-2 number, since 2×13673621² = 373935822503282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13673651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40286 + ... + 40623.

It is an arithmetic number, because the mean of its divisors is an integer number (2467755).

Almost surely, 2^13673621 is an apocalyptic number.

It is an amenable number.

13673621 is a deficient number, since it is larger than the sum of its proper divisors (1132909).

13673621 is an equidigital number, since it uses as much as digits as its factorization.

13673621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80935 (or 80922 counting only the distinct ones).

The product of its digits is 4536, while the sum is 29.

The square root of 13673621 is about 3697.7859591923. The cubic root of 13673621 is about 239.1265763934.

The spelling of 13673621 in words is "thirteen million, six hundred seventy-three thousand, six hundred twenty-one".