2801378 has 4 divisors (see below), whose sum is σ = 4202070. Its totient is φ = 1400688.

The previous prime is 2801369. The next prime is 2801401. The reversal of 2801378 is 8731082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8731082 = 2 ⋅4365541.

It can be written as a sum of positive squares in only one way, i.e., 2666689 + 134689 = 1633^2 + 367^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2801378.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700343 + ... + 700346.

2^2801378 is an apocalyptic number.

2801378 is a deficient number, since it is larger than the sum of its proper divisors (1400692).

2801378 is a wasteful number, since it uses less digits than its factorization.

2801378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400691.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 2801378 is about 1673.7317586758. The cubic root of 2801378 is about 140.9690927008.

It can be divided in two parts, 2 and 801378, that multiplied together give a square (1602756 = 1266²).

The spelling of 2801378 in words is "two million, eight hundred one thousand, three hundred seventy-eight".