2139925 has 6 divisors (see below), whose sum is σ = 2653538. Its totient is φ = 1711920.

The previous prime is 2139923. The next prime is 2139931. The reversal of 2139925 is 5299312.

It can be written as a sum of positive squares in 3 ways, for example, as 14161 + 2125764 = 119^2 + 1458^2 .

It is not a de Polignac number, because 2139925 - 2¹ = 2139923 is a prime.

It is a d-powerful number, because it can be written as 2 + 1 + 3¹¹ + 9³ + 9³ + 2¹³ + 5⁹ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139923) 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, 42774 + ... + 42823.

2^2139925 is an apocalyptic number.

2139925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2139925 is a deficient number, since it is larger than the sum of its proper divisors (513613).

2139925 is an equidigital number, since it uses as much as digits as its factorization.

2139925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85607 (or 85602 counting only the distinct ones).

The product of its digits is 4860, while the sum is 31.

The square root of 2139925 is about 1462.8482491359. The cubic root of 2139925 is about 128.8643687942.

The spelling of 2139925 in words is "two million, one hundred thirty-nine thousand, nine hundred twenty-five".