400063621 has 4 divisors (see below), whose sum is σ = 401508172. Its totient is φ = 398619072.

The previous prime is 400063619. The next prime is 400063627. The reversal of 400063621 is 126360004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 234426721 + 165636900 = 15311^2 + 12870^2 .

It is a cyclic number.

It is not a de Polignac number, because 400063621 - 2¹ = 400063619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400063592 and 400063601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400063627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721860 + ... + 722413.

It is an arithmetic number, because the mean of its divisors is an integer number (100377043).

Almost surely, 2^400063621 is an apocalyptic number.

It is an amenable number.

400063621 is a deficient number, since it is larger than the sum of its proper divisors (1444551).

400063621 is a wasteful number, since it uses less digits than its factorization.

400063621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444550.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 400063621 is about 20001.5904617608. The cubic root of 400063621 is about 736.8453612852.

The spelling of 400063621 in words is "four hundred million, sixty-three thousand, six hundred twenty-one".