29138978 has 18 divisors (see below), whose sum is σ = 48182043. Its totient is φ = 13206820.

The previous prime is 29138959. The next prime is 29138981. The reversal of 29138978 is 87983192.

It can be written as a sum of positive squares in only one way, i.e., 14569489 + 14569489 = 3817^2 + 3817^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3817.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 83801 + ... + 84147.

Almost surely, 2^29138978 is an apocalyptic number.

29138978 is a deficient number, since it is larger than the sum of its proper divisors (19043065).

29138978 is an equidigital number, since it uses as much as digits as its factorization.

29138978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718 (or 360 counting only the distinct ones).

The product of its digits is 217728, while the sum is 47.

The square root of 29138978 is about 5398.0531675781. The cubic root of 29138978 is about 307.7216873645.

The spelling of 29138978 in words is "twenty-nine million, one hundred thirty-eight thousand, nine hundred seventy-eight".