40263681 has 8 divisors (see below), whose sum is σ = 54994464. Its totient is φ = 26187680.

The previous prime is 40263677. The next prime is 40263683. The reversal of 40263681 is 18636204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40263681 - 2² = 40263677 is a prime.

It is a super-2 number, since 2×40263681² = 3242328015339522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40263683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163551 + ... + 163796.

It is an arithmetic number, because the mean of its divisors is an integer number (6874308).

It is a Proth number, since it is equal to 4915 ⋅ 2¹³ + 1 and 4915 < 2¹³.

Almost surely, 2^40263681 is an apocalyptic number.

40263681 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40263681 is a deficient number, since it is larger than the sum of its proper divisors (14730783).

40263681 is a wasteful number, since it uses less digits than its factorization.

40263681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327391.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 40263681 is about 6345.3668924657. The cubic root of 40263681 is about 342.7450243766.

Adding to 40263681 its reverse (18636204), we get a palindrome (58899885).

The spelling of 40263681 in words is "forty million, two hundred sixty-three thousand, six hundred eighty-one".