2139869 has 4 divisors (see below), whose sum is σ = 2170080. Its totient is φ = 2109660.

The previous prime is 2139859. The next prime is 2139877. The reversal of 2139869 is 9689312.

2139869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 2139869 - 2¹² = 2135773 is a prime.

It is a super-2 number, since 2×2139869² = 9158078674322, 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 (2139829) 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, 14999 + ... + 15140.

It is an arithmetic number, because the mean of its divisors is an integer number (542520).

2^2139869 is an apocalyptic number.

It is an amenable number.

2139869 is a deficient number, since it is larger than the sum of its proper divisors (30211).

2139869 is an equidigital number, since it uses as much as digits as its factorization.

2139869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30210.

The product of its digits is 23328, while the sum is 38.

The square root of 2139869 is about 1462.8291082693. The cubic root of 2139869 is about 128.8632446944.

The spelling of 2139869 in words is "two million, one hundred thirty-nine thousand, eight hundred sixty-nine".