40387813 has 4 divisors (see below), whose sum is σ = 40404960. Its totient is φ = 40370668.

The previous prime is 40387811. The next prime is 40387817. The reversal of 40387813 is 31878304.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40387813 - 2¹ = 40387811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40387811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4345 + ... + 9982.

It is an arithmetic number, because the mean of its divisors is an integer number (10101240).

Almost surely, 2^40387813 is an apocalyptic number.

It is an amenable number.

40387813 is a deficient number, since it is larger than the sum of its proper divisors (17147).

40387813 is a wasteful number, since it uses less digits than its factorization.

40387813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17146.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 40387813 is about 6355.1406750756. The cubic root of 40387813 is about 343.0968880301.

The spelling of 40387813 in words is "forty million, three hundred eighty-seven thousand, eight hundred thirteen".