2199978154 has 16 divisors (see below), whose sum is σ = 3600923040. Its totient is φ = 999723760.

The previous prime is 2199978149. The next prime is 2199978217. The reversal of 2199978154 is 4518799912.

It is a junction number, because it is equal to n+sod(n) for n = 2199978095 and 2199978104.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88452 + ... + 110560.

It is an arithmetic number, because the mean of its divisors is an integer number (225057690).

Almost surely, 2^2199978154 is an apocalyptic number.

2199978154 is a deficient number, since it is larger than the sum of its proper divisors (1400944886).

2199978154 is a wasteful number, since it uses less digits than its factorization.

2199978154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26645.

The product of its digits is 1632960, while the sum is 55.

The square root of 2199978154 is about 46903.9247185137. The cubic root of 2199978154 is about 1300.5871418794.

The spelling of 2199978154 in words is "two billion, one hundred ninety-nine million, nine hundred seventy-eight thousand, one hundred fifty-four".