2103778 has 4 divisors (see below), whose sum is σ = 3155670. Its totient is φ = 1051888.

The previous prime is 2103769. The next prime is 2103781. The reversal of 2103778 is 8773012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2064969 + 38809 = 1437^2 + 197^2 .

It is a d-powerful number, because it can be written as 2²¹ + 1 + 0 + 3⁸ + 7 + 7² + 8 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525943 + ... + 525946.

2^2103778 is an apocalyptic number.

2103778 is a deficient number, since it is larger than the sum of its proper divisors (1051892).

2103778 is a wasteful number, since it uses less digits than its factorization.

2103778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051891.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 2103778 is about 1450.4406227075. The cubic root of 2103778 is about 128.1346645892.

It can be divided in two parts, 21037 and 78, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 2103778 in words is "two million, one hundred three thousand, seven hundred seventy-eight".