2780038 has 4 divisors (see below), whose sum is σ = 4170060. Its totient is φ = 1390018.

The previous prime is 2779991. The next prime is 2780039. The reversal of 2780038 is 8300872.

It is a happy number.

2780038 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.

It is a super-2 number, since 2×2780038² = 15457222562888, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2779988 and 2780015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780039) 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 as a sum of consecutive naturals, namely, 695008 + ... + 695011.

It is an arithmetic number, because the mean of its divisors is an integer number (1042515).

2^2780038 is an apocalyptic number.

2780038 is a deficient number, since it is larger than the sum of its proper divisors (1390022).

2780038 is a wasteful number, since it uses less digits than its factorization.

2780038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390021.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 2780038 is about 1667.3445954571. The cubic root of 2780038 is about 140.6102274523.

The spelling of 2780038 in words is "two million, seven hundred eighty thousand, thirty-eight".