40138943 has 8 divisors (see below), whose sum is σ = 43335600. Its totient is φ = 36957888.

The previous prime is 40138937. The next prime is 40138957. The reversal of 40138943 is 34983104.

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

It is a cyclic number.

It is not a de Polignac number, because 40138943 - 2⁸ = 40138687 is a prime.

It is a super-2 number, since 2×40138943² = 3222269490314498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43138943) 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, 1763 + ... + 9131.

It is an arithmetic number, because the mean of its divisors is an integer number (5416950).

Almost surely, 2^40138943 is an apocalyptic number.

40138943 is a deficient number, since it is larger than the sum of its proper divisors (3196657).

40138943 is a wasteful number, since it uses less digits than its factorization.

40138943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7801.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 40138943 is about 6335.5302066994. The cubic root of 40138943 is about 342.3907137070.

The spelling of 40138943 in words is "forty million, one hundred thirty-eight thousand, nine hundred forty-three".