2154977398 has 16 divisors (see below), whose sum is σ = 3713392800. Its totient is φ = 918775296.

The previous prime is 2154977371. The next prime is 2154977413. The reversal of 2154977398 is 8937794512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396073 + ... + 401476.

It is an arithmetic number, because the mean of its divisors is an integer number (232087050).

Almost surely, 2^2154977398 is an apocalyptic number.

2154977398 is a deficient number, since it is larger than the sum of its proper divisors (1558415402).

2154977398 is a wasteful number, since it uses less digits than its factorization.

2154977398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797751.

The product of its digits is 3810240, while the sum is 55.

The square root of 2154977398 is about 46421.7341123746. The cubic root of 2154977398 is about 1291.6581042032.

The spelling of 2154977398 in words is "two billion, one hundred fifty-four million, nine hundred seventy-seven thousand, three hundred ninety-eight".