40001239 has 4 divisors (see below), whose sum is σ = 40138056. Its totient is φ = 39864424.

The previous prime is 40001231. The next prime is 40001249. The reversal of 40001239 is 93210004.

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 40001239 - 2³ = 40001231 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 (40001231) 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, 67969 + ... + 68554.

It is an arithmetic number, because the mean of its divisors is an integer number (10034514).

Almost surely, 2^40001239 is an apocalyptic number.

40001239 is a deficient number, since it is larger than the sum of its proper divisors (136817).

40001239 is a wasteful number, since it uses less digits than its factorization.

40001239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136816.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 40001239 is about 6324.6532711288. The cubic root of 40001239 is about 341.9987203992.

The spelling of 40001239 in words is "forty million, one thousand, two hundred thirty-nine".