40000442 has 4 divisors (see below), whose sum is σ = 60000666. Its totient is φ = 20000220.

The previous prime is 40000421. The next prime is 40000451. The reversal of 40000442 is 24400004.

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

It can be written as a sum of positive squares in only one way, i.e., 21242881 + 18757561 = 4609^2 + 4331^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000109 + ... + 10000112.

Almost surely, 2^40000442 is an apocalyptic number.

40000442 is a deficient number, since it is larger than the sum of its proper divisors (20000224).

40000442 is a wasteful number, since it uses less digits than its factorization.

40000442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20000223.

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 40000442 is about 6324.5902634084. The cubic root of 40000442 is about 341.9964490130.

Adding to 40000442 its reverse (24400004), we get a palindrome (64400446).

The spelling of 40000442 in words is "forty million, four hundred forty-two", and thus it is an aban number.