40001238 has 48 divisors (see below), whose sum is σ = 93315456. Its totient is φ = 12337920.

The previous prime is 40001231. The next prime is 40001249. The reversal of 40001238 is 83210004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40001238.

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 23 ways as a sum of consecutive naturals, for example, 17595 + ... + 19737.

It is an arithmetic number, because the mean of its divisors is an integer number (1944072).

Almost surely, 2^40001238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40001238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46657728).

40001238 is an abundant number, since it is smaller than the sum of its proper divisors (53314218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40001238 is a wasteful number, since it uses less digits than its factorization.

40001238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229 (or 2226 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 40001238 is about 6324.6531920731. The cubic root of 40001238 is about 341.9987175493.

The spelling of 40001238 in words is "forty million, one thousand, two hundred thirty-eight".