4978440 has 48 divisors (see below), whose sum is σ = 16181100. Its totient is φ = 1327488.

The previous prime is 4978429. The next prime is 4978447. The reversal of 4978440 is 448794.

It can be written as a sum of positive squares in 2 ways, for example, as 4639716 + 338724 = 2154^2 + 582^2 .

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 = 4978395 and 4978404.

It is not an unprimeable number, because it can be changed into a prime (4978447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6555 + ... + 7274.

Almost surely, 2^4978440 is an apocalyptic number.

4978440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4978440 is an abundant number, since it is smaller than the sum of its proper divisors (11202660).

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

4978440 is a wasteful number, since it uses less digits than its factorization.

4978440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13846 (or 13839 counting only the distinct ones).

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

The square root of 4978440 is about 2231.2418067076. The cubic root of 4978440 is about 170.7514600077.

The spelling of 4978440 in words is "four million, nine hundred seventy-eight thousand, four hundred forty".