40139678 has 8 divisors (see below), whose sum is σ = 60263568. Its totient is φ = 20051824.

The previous prime is 40139677. The next prime is 40139689. The reversal of 40139678 is 87693104.

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

It is a super-2 number, since 2×40139678² = 3222387499887368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40139677) 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, 6026 + ... + 10797.

It is an arithmetic number, because the mean of its divisors is an integer number (7532946).

Almost surely, 2^40139678 is an apocalyptic number.

40139678 is a deficient number, since it is larger than the sum of its proper divisors (20123890).

40139678 is a wasteful number, since it uses less digits than its factorization.

40139678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18018.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 40139678 is about 6335.5882126287. The cubic root of 40139678 is about 342.3928035780.

The spelling of 40139678 in words is "forty million, one hundred thirty-nine thousand, six hundred seventy-eight".