821472154 has 8 divisors (see below), whose sum is σ = 1274698260. Its totient is φ = 396572736.

The previous prime is 821472149. The next prime is 821472161. The reversal of 821472154 is 451274128.

It can be written as a sum of positive squares in 2 ways, for example, as 802418929 + 19053225 = 28327^2 + 4365^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7081599 + ... + 7081714.

Almost surely, 2^821472154 is an apocalyptic number.

821472154 is a deficient number, since it is larger than the sum of its proper divisors (453226106).

821472154 is a wasteful number, since it uses less digits than its factorization.

821472154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14163344.

The product of its digits is 17920, while the sum is 34.

The square root of 821472154 is about 28661.3355236632. The cubic root of 821472154 is about 936.5499582020.

The spelling of 821472154 in words is "eight hundred twenty-one million, four hundred seventy-two thousand, one hundred fifty-four".