4380649 has 27 divisors (see below), whose sum is σ = 5768343. Its totient is φ = 3315312.

The previous prime is 4380647. The next prime is 4380683. The reversal of 4380649 is 9460834.

The square root of 4380649 is 2093.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 648025 + 3732624 = 805^2 + 1932^2 .

It is not a de Polignac number, because 4380649 - 2¹ = 4380647 is a prime.

It is a super-2 number, since 2×4380649² = 38380171322402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4380647) by changing a digit.

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 in 26 ways as a sum of consecutive naturals, for example, 190452 + ... + 190474.

Almost surely, 2^4380649 is an apocalyptic number.

4380649 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

4380649 is the 2093-rd square number.

4380649 is the 1047-th centered octagonal number.

It is an amenable number.

4380649 is a deficient number, since it is larger than the sum of its proper divisors (1387694).

4380649 is a wasteful number, since it uses less digits than its factorization.

4380649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 43 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The cubic root of 4380649 is about 163.6236785808.

Multiplying 4380649 by its product of nonzero digits (20736), we get a square (90837137664 = 301392²).

The spelling of 4380649 in words is "four million, three hundred eighty thousand, six hundred forty-nine".