7489440 has 144 divisors (see below), whose sum is σ = 29248128. Its totient is φ = 1709568.

The previous prime is 7489423. The next prime is 7489457. The reversal of 7489440 is 449847.

It is an interprime number because it is at equal distance from previous prime (7489423) and next prime (7489457).

It is a tau number, because it is divible by the number of its divisors (144).

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

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7489395 and 7489404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9709 + ... + 10451.

It is an arithmetic number, because the mean of its divisors is an integer number (203112).

Almost surely, 2^7489440 is an apocalyptic number.

7489440 is a gapful number since it is divisible by the number (70) 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 7489440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14624064).

7489440 is an abundant number, since it is smaller than the sum of its proper divisors (21758688).

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

7489440 is a wasteful number, since it uses less digits than its factorization.

7489440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 760 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 7489440 is about 2736.6841249951. The cubic root of 7489440 is about 195.6514700136.

The spelling of 7489440 in words is "seven million, four hundred eighty-nine thousand, four hundred forty".