40387042 has 4 divisors (see below), whose sum is σ = 60580566. Its totient is φ = 20193520.

The previous prime is 40387013. The next prime is 40387049. The reversal of 40387042 is 24078304.

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., 37222201 + 3164841 = 6101^2 + 1779^2 .

It is a super-2 number, since 2×40387042² = 3262226323019528, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40387042.

It is not an unprimeable number, because it can be changed into a prime (40387049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10096759 + ... + 10096762.

Almost surely, 2^40387042 is an apocalyptic number.

40387042 is a deficient number, since it is larger than the sum of its proper divisors (20193524).

40387042 is a wasteful number, since it uses less digits than its factorization.

40387042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20193523.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 40387042 is about 6355.0800152319. The cubic root of 40387042 is about 343.0947047859.

The spelling of 40387042 in words is "forty million, three hundred eighty-seven thousand, forty-two".