152840921 has 4 divisors (see below), whose sum is σ = 160885200. Its totient is φ = 144796644.

The previous prime is 152840917. The next prime is 152840927. The reversal of 152840921 is 129048251.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129048251 = 71 ⋅1817581.

It is not a de Polignac number, because 152840921 - 2² = 152840917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (152840927) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4022111 + ... + 4022148.

It is an arithmetic number, because the mean of its divisors is an integer number (40221300).

Almost surely, 2^152840921 is an apocalyptic number.

It is an amenable number.

152840921 is a deficient number, since it is larger than the sum of its proper divisors (8044279).

152840921 is an equidigital number, since it uses as much as digits as its factorization.

152840921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8044278.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 152840921 is about 12362.8848170643. The cubic root of 152840921 is about 534.6626936018.

The spelling of 152840921 in words is "one hundred fifty-two million, eight hundred forty thousand, nine hundred twenty-one".