29978121 has 8 divisors (see below), whose sum is σ = 40006720. Its totient is φ = 19967472.

The previous prime is 29978119. The next prime is 29978129. The reversal of 29978121 is 12187992.

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

It is not a de Polignac number, because 29978121 - 2¹ = 29978119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 29978121.

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 in 7 ways as a sum of consecutive naturals, for example, 75 + ... + 7743.

It is an arithmetic number, because the mean of its divisors is an integer number (5000840).

Almost surely, 2^29978121 is an apocalyptic number.

It is an amenable number.

29978121 is a deficient number, since it is larger than the sum of its proper divisors (10028599).

29978121 is a wasteful number, since it uses less digits than its factorization.

29978121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8975.

The product of its digits is 18144, while the sum is 39.

The square root of 29978121 is about 5475.2279404606. The cubic root of 29978121 is about 310.6476954027.

The spelling of 29978121 in words is "twenty-nine million, nine hundred seventy-eight thousand, one hundred twenty-one".