43979540 has 48 divisors (see below), whose sum is σ = 103118400. Its totient is φ = 15617280.

The previous prime is 43979521. The next prime is 43979543. The reversal of 43979540 is 4597934.

43979540 = 341² + 342² + ... + 555².

It is a super-2 number, since 2×43979540² = 3868399877223200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43979543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7136 + ... + 11784.

It is an arithmetic number, because the mean of its divisors is an integer number (2148300).

Almost surely, 2^43979540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43979540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51559200).

43979540 is an abundant number, since it is smaller than the sum of its proper divisors (59138860).

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

43979540 is a wasteful number, since it uses less digits than its factorization.

43979540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4712 (or 4710 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 43979540 is about 6631.7071708573. The cubic root of 43979540 is about 352.9801046496.

The spelling of 43979540 in words is "forty-three million, nine hundred seventy-nine thousand, five hundred forty".