40587391 has 4 divisors (see below), whose sum is σ = 43709512. Its totient is φ = 37465272.

The previous prime is 40587361. The next prime is 40587397. The reversal of 40587391 is 19378504.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 40587391 - 2⁷ = 40587263 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40587391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40587397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1561041 + ... + 1561066.

It is an arithmetic number, because the mean of its divisors is an integer number (10927378).

Almost surely, 2^40587391 is an apocalyptic number.

40587391 is a deficient number, since it is larger than the sum of its proper divisors (3122121).

40587391 is a wasteful number, since it uses less digits than its factorization.

40587391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3122120.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 40587391 is about 6370.8234161684. The cubic root of 40587391 is about 343.6611020367.

It can be divided in two parts, 4058 and 7391, that added together give a square (11449 = 107²).

The spelling of 40587391 in words is "forty million, five hundred eighty-seven thousand, three hundred ninety-one".