2780129 has 8 divisors (see below), whose sum is σ = 3211488. Its totient is φ = 2378560.

The previous prime is 2780123. The next prime is 2780131. The reversal of 2780129 is 9210872.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2780129 - 2⁸ = 2779873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2780123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7247 + ... + 7620.

It is an arithmetic number, because the mean of its divisors is an integer number (401436).

2^2780129 is an apocalyptic number.

It is an amenable number.

2780129 is a deficient number, since it is larger than the sum of its proper divisors (431359).

2780129 is a wasteful number, since it uses less digits than its factorization.

2780129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14895.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 2780129 is about 1667.3718841338. The cubic root of 2780129 is about 140.6117616509.

The spelling of 2780129 in words is "two million, seven hundred eighty thousand, one hundred twenty-nine".