2780139 has 16 divisors (see below), whose sum is σ = 3830400. Its totient is φ = 1792896.

The previous prime is 2780131. The next prime is 2780149. The reversal of 2780139 is 9310872.

It is a happy number.

It is not a de Polignac number, because 2780139 - 2³ = 2780131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2780131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19932 + ... + 20070.

It is an arithmetic number, because the mean of its divisors is an integer number (239400).

2^2780139 is an apocalyptic number.

2780139 is a deficient number, since it is larger than the sum of its proper divisors (1050261).

2780139 is a wasteful number, since it uses less digits than its factorization.

2780139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 2780139 is about 1667.3748828623. The cubic root of 2780139 is about 140.6119302421.

The spelling of 2780139 in words is "two million, seven hundred eighty thousand, one hundred thirty-nine".