400451421404254 has 24 divisors (see below), whose sum is σ = 681546754010304. Its totient is φ = 176151651640800.

The previous prime is 400451421404147. The next prime is 400451421404257. The reversal of 400451421404254 is 452404124154004.

It is a super-2 number, since 2×400451421404254² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400451421404257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26689636687 + ... + 26689651690.

It is an arithmetic number, because the mean of its divisors is an integer number (28397781417096).

Almost surely, 2^{400451421404254} is an apocalyptic number.

400451421404254 is a deficient number, since it is larger than the sum of its proper divisors (281095332606050).

400451421404254 is a wasteful number, since it uses less digits than its factorization.

400451421404254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53379288432 (or 53379288421 counting only the distinct ones).

The product of its (nonzero) digits is 409600, while the sum is 40.

Adding to 400451421404254 its reverse (452404124154004), we get a palindrome (852855545558258).

The spelling of 400451421404254 in words is "four hundred trillion, four hundred fifty-one billion, four hundred twenty-one million, four hundred four thousand, two hundred fifty-four".