40173839 has 4 divisors (see below), whose sum is σ = 42537024. Its totient is φ = 37810656.

The previous prime is 40173829. The next prime is 40173869. The reversal of 40173839 is 93837104.

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

It is a cyclic number.

It is not a de Polignac number, because 40173839 - 2²⁴ = 23396623 is a prime.

It is a super-2 number, since 2×40173839² = 3227874679995842, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40173799 and 40173808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40173829) 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, 1181567 + ... + 1181600.

It is an arithmetic number, because the mean of its divisors is an integer number (10634256).

Almost surely, 2^40173839 is an apocalyptic number.

40173839 is a deficient number, since it is larger than the sum of its proper divisors (2363185).

40173839 is a wasteful number, since it uses less digits than its factorization.

40173839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363184.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 40173839 is about 6338.2836004710. The cubic root of 40173839 is about 342.4899075293.

The spelling of 40173839 in words is "forty million, one hundred seventy-three thousand, eight hundred thirty-nine".