400262021 has 4 divisors (see below), whose sum is σ = 400881312. Its totient is φ = 399642732.

The previous prime is 400261997. The next prime is 400262029. The reversal of 400262021 is 120262004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400262021 - 2¹⁰ = 400260997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400262029) 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, 308675 + ... + 309968.

It is an arithmetic number, because the mean of its divisors is an integer number (100220328).

Almost surely, 2^400262021 is an apocalyptic number.

It is an amenable number.

400262021 is a deficient number, since it is larger than the sum of its proper divisors (619291).

400262021 is an equidigital number, since it uses as much as digits as its factorization.

400262021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619290.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 400262021 is about 20006.5494526168. The cubic root of 400262021 is about 736.9671468816.

Subtracting from 400262021 its sum of digits (17), we obtain a palindrome (400262004).

The spelling of 400262021 in words is "four hundred million, two hundred sixty-two thousand, twenty-one".