40253391 has 12 divisors (see below), whose sum is σ = 58400680. Its totient is φ = 26717040.

The previous prime is 40253359. The next prime is 40253401. The reversal of 40253391 is 19335204.

40253391 is a `hidden beast` number, since 40 + 2 + 533 + 91 = 666.

It is not a de Polignac number, because 40253391 - 2⁵ = 40253359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40253791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7705 + ... + 11826.

Almost surely, 2^40253391 is an apocalyptic number.

40253391 is a deficient number, since it is larger than the sum of its proper divisors (18147289).

40253391 is a wasteful number, since it uses less digits than its factorization.

40253391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19766 (or 19763 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 40253391 is about 6344.5560128349. The cubic root of 40253391 is about 342.7158239764.

Adding to 40253391 its reverse (19335204), we get a palindrome (59588595).

The spelling of 40253391 in words is "forty million, two hundred fifty-three thousand, three hundred ninety-one".