40135381 has 16 divisors (see below), whose sum is σ = 47331648. Its totient is φ = 33552000.

The previous prime is 40135367. The next prime is 40135393. The reversal of 40135381 is 18353104.

40135381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 40135381 - 2¹⁷ = 40004309 is a prime.

It is a super-2 number, since 2×40135381² = 3221697616030322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40133381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66481 + ... + 67081.

It is an arithmetic number, because the mean of its divisors is an integer number (2958228).

Almost surely, 2^40135381 is an apocalyptic number.

It is an amenable number.

40135381 is a deficient number, since it is larger than the sum of its proper divisors (7196267).

40135381 is a wasteful number, since it uses less digits than its factorization.

40135381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 40135381 is about 6335.2490874472. The cubic root of 40135381 is about 342.3805852904.

Adding to 40135381 its reverse (18353104), we get a palindrome (58488485).

The spelling of 40135381 in words is "forty million, one hundred thirty-five thousand, three hundred eighty-one".