43257540 has 96 divisors (see below), whose sum is σ = 125991936. Its totient is φ = 11082240.

The previous prime is 43257521. The next prime is 43257553. The reversal of 43257540 is 4575234.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 43257498 and 43257507.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 193869 + ... + 194091.

It is an arithmetic number, because the mean of its divisors is an integer number (1312416).

Almost surely, 2^43257540 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 43257540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62995968).

43257540 is an abundant number, since it is smaller than the sum of its proper divisors (82734396).

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

43257540 is a wasteful number, since it uses less digits than its factorization.

43257540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 30.

The square root of 43257540 is about 6577.0464495851. The cubic root of 43257540 is about 351.0378446382.

The spelling of 43257540 in words is "forty-three million, two hundred fifty-seven thousand, five hundred forty".