40142839 has 18 divisors (see below), whose sum is σ = 46619160. Its totient is φ = 34535160.

The previous prime is 40142821. The next prime is 40142857. The reversal of 40142839 is 93824104.

It is an interprime number because it is at equal distance from previous prime (40142821) and next prime (40142857).

It is a de Polignac number, because none of the positive numbers 2^k-40142839 is a prime.

It is a super-2 number, since 2×40142839² = 3222895045959842, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 40142839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40142339) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 43222 + ... + 44140.

Almost surely, 2^40142839 is an apocalyptic number.

40142839 is a deficient number, since it is larger than the sum of its proper divisors (6476321).

40142839 is a wasteful number, since it uses less digits than its factorization.

40142839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979 (or 949 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 40142839 is about 6335.8376715317. The cubic root of 40142839 is about 342.4017911542.

The spelling of 40142839 in words is "forty million, one hundred forty-two thousand, eight hundred thirty-nine".