4378661 has 8 divisors (see below), whose sum is σ = 5111040. Its totient is φ = 3673008.

The previous prime is 4378631. The next prime is 4378697. The reversal of 4378661 is 1668734.

4378661 = T₁₁₁₅ + T₁₁₁₆ + ... + T₁₁₂₁.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4378661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4378631) 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, 6326 + ... + 6983.

It is an arithmetic number, because the mean of its divisors is an integer number (638880).

Almost surely, 2^4378661 is an apocalyptic number.

It is an amenable number.

4378661 is a deficient number, since it is larger than the sum of its proper divisors (732379).

4378661 is a wasteful number, since it uses less digits than its factorization.

4378661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13363.

The product of its digits is 24192, while the sum is 35.

The square root of 4378661 is about 2092.5250297189. The cubic root of 4378661 is about 163.5989232617.

The spelling of 4378661 in words is "four million, three hundred seventy-eight thousand, six hundred sixty-one".