40142731 has 8 divisors (see below), whose sum is σ = 41215104. Its totient is φ = 39074880.

The previous prime is 40142717. The next prime is 40142749. The reversal of 40142731 is 13724104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40142731 - 2⁷ = 40142603 is a prime.

It is a super-2 number, since 2×40142731² = 3222877704276722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40143731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24081 + ... + 25693.

It is an arithmetic number, because the mean of its divisors is an integer number (5151888).

Almost surely, 2^40142731 is an apocalyptic number.

40142731 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

40142731 is a deficient number, since it is larger than the sum of its proper divisors (1072373).

40142731 is a wasteful number, since it uses less digits than its factorization.

40142731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 40142731 is about 6335.8291485803. The cubic root of 40142731 is about 342.4014840888.

Adding to 40142731 its reverse (13724104), we get a palindrome (53866835).

The spelling of 40142731 in words is "forty million, one hundred forty-two thousand, seven hundred thirty-one".