40238797 has 4 divisors (see below), whose sum is σ = 40370176. Its totient is φ = 40107420.

The previous prime is 40238777. The next prime is 40238839. The reversal of 40238797 is 79783204.

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 a de Polignac number, because none of the positive numbers 2^k-40238797 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 (40238717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65229 + ... + 65842.

It is an arithmetic number, because the mean of its divisors is an integer number (10092544).

It is a Poulet number, since it divides 2^40238796-1.

Almost surely, 2^40238797 is an apocalyptic number.

It is an amenable number.

40238797 is a deficient number, since it is larger than the sum of its proper divisors (131379).

40238797 is a wasteful number, since it uses less digits than its factorization.

40238797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131378.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 40238797 is about 6343.4057886911. The cubic root of 40238797 is about 342.6744013850.

The spelling of 40238797 in words is "forty million, two hundred thirty-eight thousand, seven hundred ninety-seven".