40135688 has 8 divisors (see below), whose sum is σ = 75254430. Its totient is φ = 20067840.

The previous prime is 40135673. The next prime is 40135699. The reversal of 40135688 is 88653104.

It can be written as a sum of positive squares in only one way, i.e., 33895684 + 6240004 = 5822^2 + 2498^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×40135688² = 3221746902466688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2508473 + ... + 2508488.

Almost surely, 2^40135688 is an apocalyptic number.

It is an amenable number.

40135688 is a deficient number, since it is larger than the sum of its proper divisors (35118742).

40135688 is a wasteful number, since it uses less digits than its factorization.

40135688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5016967 (or 5016963 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 40135688 is about 6335.2733169138. The cubic root of 40135688 is about 342.3814582573.

The spelling of 40135688 in words is "forty million, one hundred thirty-five thousand, six hundred eighty-eight".