4389840 has 240 divisors, whose sum is σ = 18415488. Its totient is φ = 912384.

The previous prime is 4389839. The next prime is 4389841. The reversal of 4389840 is 489834.

4389840 = T₂₆₄ + T₂₆₅ + ... + T₃₅₄.

It is an interprime number because it is at equal distance from previous prime (4389839) and next prime (4389841).

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 4389795 and 4389804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4389841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65487 + ... + 65553.

Almost surely, 2^4389840 is an apocalyptic number.

4389840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4389840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9207744).

4389840 is an abundant number, since it is smaller than the sum of its proper divisors (14025648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4389840 is a wasteful number, since it uses less digits than its factorization.

4389840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 4389840 is about 2095.1945017110. The cubic root of 4389840 is about 163.7380310969.

The spelling of 4389840 in words is "four million, three hundred eighty-nine thousand, eight hundred forty".