400032021 has 8 divisors (see below), whose sum is σ = 535197600. Its totient is φ = 265777232.

The previous prime is 400032007. The next prime is 400032037. The reversal of 400032021 is 120230004.

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

It is a cyclic number.

It is not a de Polignac number, because 400032021 - 2⁹ = 400031509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400031988 and 400032006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400032041) 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, 226671 + ... + 228428.

It is an arithmetic number, because the mean of its divisors is an integer number (66899700).

Almost surely, 2^400032021 is an apocalyptic number.

It is an amenable number.

400032021 is a deficient number, since it is larger than the sum of its proper divisors (135165579).

400032021 is a wasteful number, since it uses less digits than its factorization.

400032021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455395.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 400032021 is about 20000.8005089796. The cubic root of 400032021 is about 736.8259602656.

Adding to 400032021 its reverse (120230004), we get a palindrome (520262025).

It can be divided in two parts, 40003 and 2021, that added together give a palindrome (42024).

The spelling of 400032021 in words is "four hundred million, thirty-two thousand, twenty-one".