40043253 has 16 divisors (see below), whose sum is σ = 55872000. Its totient is φ = 25461744.

The previous prime is 40043251. The next prime is 40043257. The reversal of 40043253 is 35234004.

It is a happy number.

It is not a de Polignac number, because 40043253 - 2¹ = 40043251 is a prime.

It is a super-2 number, since 2×40043253² = 3206924221644018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40043251) 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, 33850 + ... + 35012.

It is an arithmetic number, because the mean of its divisors is an integer number (3492000).

Almost surely, 2^40043253 is an apocalyptic number.

It is an amenable number.

40043253 is a deficient number, since it is larger than the sum of its proper divisors (15828747).

40043253 is a wasteful number, since it uses less digits than its factorization.

40043253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688.

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 40043253 is about 6327.9738463429. The cubic root of 40043253 is about 342.1184142467.

Adding to 40043253 its reverse (35234004), we get a palindrome (75277257).

Subtracting from 40043253 its reverse (35234004), we obtain a square (4809249 = 2193²).

The spelling of 40043253 in words is "forty million, forty-three thousand, two hundred fifty-three".