40142644 has 48 divisors (see below), whose sum is σ = 77898240. Its totient is φ = 18017280.

The previous prime is 40142639. The next prime is 40142651. The reversal of 40142644 is 44624104.

It is a super-2 number, since 2×40142644² = 3222863734621472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 288727 + ... + 288865.

It is an arithmetic number, because the mean of its divisors is an integer number (1622880).

Almost surely, 2^40142644 is an apocalyptic number.

It is an amenable number.

40142644 is a deficient number, since it is larger than the sum of its proper divisors (37755596).

40142644 is a wasteful number, since it uses less digits than its factorization.

40142644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 40142644 is about 6335.8222828612. The cubic root of 40142644 is about 342.4012367302.

Adding to 40142644 its reverse (44624104), we get a palindrome (84766748).

The spelling of 40142644 in words is "forty million, one hundred forty-two thousand, six hundred forty-four".