40203540 has 240 divisors, whose sum is σ = 143434368. Its totient is φ = 9351936.

The previous prime is 40203529. The next prime is 40203547. The reversal of 40203540 is 4530204.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40203547) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 484339 + ... + 484421.

Almost surely, 2^40203540 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 40203540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71717184).

40203540 is an abundant number, since it is smaller than the sum of its proper divisors (103230828).

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

40203540 is a wasteful number, since it uses less digits than its factorization.

40203540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 40203540 is about 6340.6261520452. The cubic root of 40203540 is about 342.5742890339.

Adding to 40203540 its reverse (4530204), we get a palindrome (44733744).

The spelling of 40203540 in words is "forty million, two hundred three thousand, five hundred forty".