40021254 has 96 divisors (see below), whose sum is σ = 108972864. Its totient is φ = 10333440.

The previous prime is 40021249. The next prime is 40021259. The reversal of 40021254 is 45212004.

40021254 is a `hidden beast` number, since 400 + 212 + 54 = 666.

It is an interprime number because it is at equal distance from previous prime (40021249) and next prime (40021259).

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 86584 + ... + 87044.

It is an arithmetic number, because the mean of its divisors is an integer number (1135134).

Almost surely, 2^40021254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40021254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54486432).

40021254 is an abundant number, since it is smaller than the sum of its proper divisors (68951610).

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

40021254 is a wasteful number, since it uses less digits than its factorization.

40021254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 40021254 is about 6326.2353734271. The cubic root of 40021254 is about 342.0557516580.

Adding to 40021254 its reverse (45212004), we get a palindrome (85233258).

The spelling of 40021254 in words is "forty million, twenty-one thousand, two hundred fifty-four".