40021742 has 4 divisors (see below), whose sum is σ = 60032616. Its totient is φ = 20010870.

The previous prime is 40021727. The next prime is 40021747. The reversal of 40021742 is 24712004.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005434 + ... + 10005437.

It is an arithmetic number, because the mean of its divisors is an integer number (15008154).

Almost surely, 2^40021742 is an apocalyptic number.

40021742 is a deficient number, since it is larger than the sum of its proper divisors (20010874).

40021742 is a wasteful number, since it uses less digits than its factorization.

40021742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20010873.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 40021742 is about 6326.2739428514. The cubic root of 40021742 is about 342.0571419403.

Adding to 40021742 its reverse (24712004), we get a palindrome (64733746).

The spelling of 40021742 in words is "forty million, twenty-one thousand, seven hundred forty-two".