29139978 has 16 divisors (see below), whose sum is σ = 66605760. Its totient is φ = 8325696.

The previous prime is 29139973. The next prime is 29140049. The reversal of 29139978 is 87993192.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (29139973) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 346863 + ... + 346946.

It is an arithmetic number, because the mean of its divisors is an integer number (4162860).

Almost surely, 2^29139978 is an apocalyptic number.

29139978 is an abundant number, since it is smaller than the sum of its proper divisors (37465782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

29139978 is a wasteful number, since it uses less digits than its factorization.

29139978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693821.

The product of its digits is 244944, while the sum is 48.

The square root of 29139978 is about 5398.1457927700. The cubic root of 29139978 is about 307.7252074853.

The spelling of 29139978 in words is "twenty-nine million, one hundred thirty-nine thousand, nine hundred seventy-eight".