40015442 has 4 divisors (see below), whose sum is σ = 60023166. Its totient is φ = 20007720.

The previous prime is 40015441. The next prime is 40015483. The reversal of 40015442 is 24451004.

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., 36735721 + 3279721 = 6061^2 + 1811^2 .

It is not an unprimeable number, because it can be changed into a prime (40015441) 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 as a sum of consecutive naturals, namely, 10003859 + ... + 10003862.

Almost surely, 2^40015442 is an apocalyptic number.

40015442 is a deficient number, since it is larger than the sum of its proper divisors (20007724).

40015442 is a wasteful number, since it uses less digits than its factorization.

40015442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20007723.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 40015442 is about 6325.7759998280. The cubic root of 40015442 is about 342.0391927543.

Adding to 40015442 its reverse (24451004), we get a palindrome (64466446).

The spelling of 40015442 in words is "forty million, fifteen thousand, four hundred forty-two".