40042531 has 4 divisors (see below), whose sum is σ = 42397992. Its totient is φ = 37687072.

The previous prime is 40042469. The next prime is 40042553. The reversal of 40042531 is 13524004.

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

It is a cyclic number.

It is not a de Polignac number, because 40042531 - 2¹³ = 40034339 is a prime.

It is a super-2 number, since 2×40042531² = 3206808577771922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40042499 and 40042508.

It is not an unprimeable number, because it can be changed into a prime (40042571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1177705 + ... + 1177738.

It is an arithmetic number, because the mean of its divisors is an integer number (10599498).

Almost surely, 2^40042531 is an apocalyptic number.

40042531 is a deficient number, since it is larger than the sum of its proper divisors (2355461).

40042531 is a wasteful number, since it uses less digits than its factorization.

40042531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355460.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 40042531 is about 6327.9167978095. The cubic root of 40042531 is about 342.1163580452.

Adding to 40042531 its reverse (13524004), we get a palindrome (53566535).

The spelling of 40042531 in words is "forty million, forty-two thousand, five hundred thirty-one".