2139445 has 16 divisors (see below), whose sum is σ = 3201408. Its totient is φ = 1333440.

The previous prime is 2139427. The next prime is 2139461. The reversal of 2139445 is 5449312.

It is not a de Polignac number, because 2139445 - 2¹¹ = 2137397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2394 + ... + 3163.

It is an arithmetic number, because the mean of its divisors is an integer number (200088).

2^2139445 is an apocalyptic number.

It is an amenable number.

2139445 is a deficient number, since it is larger than the sum of its proper divisors (1061963).

2139445 is a wasteful number, since it uses less digits than its factorization.

2139445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5580.

The product of its digits is 4320, while the sum is 28.

The square root of 2139445 is about 1462.6841764373. The cubic root of 2139445 is about 128.8547330168.

The spelling of 2139445 in words is "two million, one hundred thirty-nine thousand, four hundred forty-five".