156440121 has 8 divisors (see below), whose sum is σ = 208689024. Its totient is φ = 104242320.

The previous prime is 156440117. The next prime is 156440147. The reversal of 156440121 is 121044651.

It is a happy number.

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

It is not a de Polignac number, because 156440121 - 2² = 156440117 is a prime.

It is a super-2 number, since 2×156440121² = 48947022916989282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 156440091 and 156440100.

It is not an unprimeable number, because it can be changed into a prime (156440101) 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 7 ways as a sum of consecutive naturals, for example, 4945 + ... + 18366.

It is an arithmetic number, because the mean of its divisors is an integer number (26086128).

Almost surely, 2^156440121 is an apocalyptic number.

It is an amenable number.

156440121 is a deficient number, since it is larger than the sum of its proper divisors (52248903).

156440121 is a wasteful number, since it uses less digits than its factorization.

156440121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25551.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 156440121 is about 12507.6025280627. The cubic root of 156440121 is about 538.8270390457.

Adding to 156440121 its reverse (121044651), we get a palindrome (277484772).

The spelling of 156440121 in words is "one hundred fifty-six million, four hundred forty thousand, one hundred twenty-one".