400412421 has 6 divisors (see below), whose sum is σ = 578373510. Its totient is φ = 266941608.

The previous prime is 400412401. The next prime is 400412429. The reversal of 400412421 is 124214004.

It can be written as a sum of positive squares in only one way, i.e., 400400100 + 12321 = 20010^2 + 111^2 .

It is not a de Polignac number, because 400412421 - 2⁷ = 400412293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400412394 and 400412403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400412429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22245126 + ... + 22245143.

It is an arithmetic number, because the mean of its divisors is an integer number (96395585).

Almost surely, 2^400412421 is an apocalyptic number.

It is an amenable number.

400412421 is a deficient number, since it is larger than the sum of its proper divisors (177961089).

400412421 is a wasteful number, since it uses less digits than its factorization.

400412421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44490275 (or 44490272 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 400412421 is about 20010.3078686961. The cubic root of 400412421 is about 737.0594414063.

Adding to 400412421 its reverse (124214004), we get a palindrome (524626425).

The spelling of 400412421 in words is "four hundred million, four hundred twelve thousand, four hundred twenty-one".