40388091 has 8 divisors (see below), whose sum is σ = 56685120. Its totient is φ = 25508232.

The previous prime is 40388083. The next prime is 40388099. The reversal of 40388091 is 19088304.

It is an interprime number because it is at equal distance from previous prime (40388083) and next prime (40388099).

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

It is not a de Polignac number, because 40388091 - 2³ = 40388083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40388099) 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, 354225 + ... + 354338.

It is an arithmetic number, because the mean of its divisors is an integer number (7085640).

Almost surely, 2^40388091 is an apocalyptic number.

40388091 is a deficient number, since it is larger than the sum of its proper divisors (16297029).

40388091 is a wasteful number, since it uses less digits than its factorization.

40388091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708585.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 40388091 is about 6355.1625470951. The cubic root of 40388091 is about 343.0976752372.

The spelling of 40388091 in words is "forty million, three hundred eighty-eight thousand, ninety-one".