29978122 has 4 divisors (see below), whose sum is σ = 44967186. Its totient is φ = 14989060.

The previous prime is 29978119. The next prime is 29978129. The reversal of 29978122 is 22187992.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21631801 + 8346321 = 4651^2 + 2889^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (29978129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7494529 + ... + 7494532.

Almost surely, 2^29978122 is an apocalyptic number.

29978122 is a deficient number, since it is larger than the sum of its proper divisors (14989064).

29978122 is a wasteful number, since it uses less digits than its factorization.

29978122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14989063.

The product of its digits is 36288, while the sum is 40.

The square root of 29978122 is about 5475.2280317810. The cubic root of 29978122 is about 310.6476988569.

The spelling of 29978122 in words is "twenty-nine million, nine hundred seventy-eight thousand, one hundred twenty-two".