400145211122520 has 32 divisors (see below), whose sum is σ = 1200435633367920. Its totient is φ = 106705389632640.

The previous prime is 400145211122483. The next prime is 400145211122521. The reversal of 400145211122520 is 25221112541004.

It is a super-2 number, since 2×400145211122520² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400145211122521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1667271712891 + ... + 1667271713130.

Almost surely, 2^{400145211122520} is an apocalyptic number.

400145211122520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400145211122520 is an abundant number, since it is smaller than the sum of its proper divisors (800290422245400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400145211122520 is a wasteful number, since it uses less digits than its factorization.

400145211122520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334543426035 (or 3334543426031 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

Adding to 400145211122520 its reverse (25221112541004), we get a palindrome (425366323663524).

The spelling of 400145211122520 in words is "four hundred trillion, one hundred forty-five billion, two hundred eleven million, one hundred twenty-two thousand, five hundred twenty".