40139471 has 2 divisors, whose sum is σ = 40139472. Its totient is φ = 40139470.

The previous prime is 40139467. The next prime is 40139483. The reversal of 40139471 is 17493104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40139471 - 2² = 40139467 is a prime.

It is a super-3 number, since 3×40139471³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40139171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20069735 + 20069736.

It is an arithmetic number, because the mean of its divisors is an integer number (20069736).

Almost surely, 2^40139471 is an apocalyptic number.

40139471 is a deficient number, since it is larger than the sum of its proper divisors (1).

40139471 is an equidigital number, since it uses as much as digits as its factorization.

40139471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 40139471 is about 6335.5718763187. The cubic root of 40139471 is about 342.3922150046.

The spelling of 40139471 in words is "forty million, one hundred thirty-nine thousand, four hundred seventy-one".