40263381 has 12 divisors (see below), whose sum is σ = 58348108. Its totient is φ = 26754624.

The previous prime is 40263367. The next prime is 40263403. The reversal of 40263381 is 18336204.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 194481 + 40068900 = 441^2 + 6330^2 .

It is not a de Polignac number, because 40263381 - 2⁹ = 40262869 is a prime.

It is a super-2 number, since 2×40263381² = 3242279699102322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40263331) 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, 4330 + ... + 9963.

Almost surely, 2^40263381 is an apocalyptic number.

It is an amenable number.

40263381 is a deficient number, since it is larger than the sum of its proper divisors (18084727).

40263381 is a wasteful number, since it uses less digits than its factorization.

40263381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14612 (or 14609 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 40263381 is about 6345.3432531267. The cubic root of 40263381 is about 342.7441731234.

Adding to 40263381 its reverse (18336204), we get a palindrome (58599585).

The spelling of 40263381 in words is "forty million, two hundred sixty-three thousand, three hundred eighty-one".