40243554 has 80 divisors (see below), whose sum is σ = 98611128. Its totient is φ = 12192768.

The previous prime is 40243547. The next prime is 40243579. The reversal of 40243554 is 45534204.

It can be written as a sum of positive squares in 4 ways, for example, as 36905625 + 3337929 = 6075^2 + 1827^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 204184 + ... + 204380.

Almost surely, 2^40243554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40243554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49305564).

40243554 is an abundant number, since it is smaller than the sum of its proper divisors (58367574).

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

40243554 is a wasteful number, since it uses less digits than its factorization.

40243554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 40243554 is about 6343.7807339157. The cubic root of 40243554 is about 342.6879044220.

Adding to 40243554 its reverse (45534204), we get a palindrome (85777758).

It can be divided in two parts, 402 and 43554, that added together give a triangular number (43956 = T₂₉₆).

The spelling of 40243554 in words is "forty million, two hundred forty-three thousand, five hundred fifty-four".