13820279 has 4 divisors (see below), whose sum is σ = 15076680. Its totient is φ = 12563880.

The previous prime is 13820237. The next prime is 13820293. The reversal of 13820279 is 97202831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97202831 = 11 ⋅8836621.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13820279 is a prime.

It is a super-2 number, since 2×13820279² = 382000223275682, 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 (13820299) 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, 628184 + ... + 628205.

It is an arithmetic number, because the mean of its divisors is an integer number (3769170).

Almost surely, 2^13820279 is an apocalyptic number.

13820279 is a deficient number, since it is larger than the sum of its proper divisors (1256401).

13820279 is a wasteful number, since it uses less digits than its factorization.

13820279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256400.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 13820279 is about 3717.5635838544. The cubic root of 13820279 is about 239.9784645028.

The spelling of 13820279 in words is "thirteen million, eight hundred twenty thousand, two hundred seventy-nine".