400121528109 has 8 divisors (see below), whose sum is σ = 564877451520. Its totient is φ = 251056645056.

The previous prime is 400121528083. The next prime is 400121528167. The reversal of 400121528109 is 901825121004.

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

It is not a de Polignac number, because 400121528109 - 2⁸ = 400121527853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400121528109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400121528179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3922760029 + ... + 3922760130.

It is an arithmetic number, because the mean of its divisors is an integer number (70609681440).

Almost surely, 2^400121528109 is an apocalyptic number.

It is an amenable number.

400121528109 is a deficient number, since it is larger than the sum of its proper divisors (164755923411).

400121528109 is a wasteful number, since it uses less digits than its factorization.

400121528109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7845520179.

The product of its (nonzero) digits is 5760, while the sum is 33.

The spelling of 400121528109 in words is "four hundred billion, one hundred twenty-one million, five hundred twenty-eight thousand, one hundred nine".