398121299 has 4 divisors (see below), whose sum is σ = 398507736. Its totient is φ = 397734864.

The previous prime is 398121293. The next prime is 398121323. The reversal of 398121299 is 992121893.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 398121299 - 2²⁴ = 381344083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398121293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191669 + ... + 193734.

It is an arithmetic number, because the mean of its divisors is an integer number (99626934).

Almost surely, 2^398121299 is an apocalyptic number.

398121299 is a deficient number, since it is larger than the sum of its proper divisors (386437).

398121299 is a wasteful number, since it uses less digits than its factorization.

398121299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386436.

The product of its digits is 69984, while the sum is 44.

The square root of 398121299 is about 19952.9771963985. The cubic root of 398121299 is about 735.6509567724.

The spelling of 398121299 in words is "three hundred ninety-eight million, one hundred twenty-one thousand, two hundred ninety-nine".