3778729 has 8 divisors (see below), whose sum is σ = 3933000. Its totient is φ = 3626112.

The previous prime is 3778727. The next prime is 3778759. The reversal of 3778729 is 9278773.

3778729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 810000 + 2968729 = 900^2 + 1723^2 .

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 3778729 - 2¹ = 3778727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3778727) 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 in 7 ways as a sum of consecutive naturals, for example, 6357 + ... + 6925.

It is an arithmetic number, because the mean of its divisors is an integer number (491625).

Almost surely, 2^3778729 is an apocalyptic number.

It is an amenable number.

3778729 is a deficient number, since it is larger than the sum of its proper divisors (154271).

3778729 is a wasteful number, since it uses less digits than its factorization.

3778729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827.

The product of its digits is 148176, while the sum is 43.

The square root of 3778729 is about 1943.8953161114. The cubic root of 3778729 is about 155.7573616803.

The spelling of 3778729 in words is "three million, seven hundred seventy-eight thousand, seven hundred twenty-nine".