407021 has 4 divisors (see below), whose sum is σ = 409344. Its totient is φ = 404700.

The previous prime is 406993. The next prime is 407023. The reversal of 407021 is 120704.

It is a happy number.

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 407021 - 2¹⁰ = 405997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 406987 and 407005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (407023) 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, 875 + ... + 1256.

It is an arithmetic number, because the mean of its divisors is an integer number (102336).

2⁴⁰⁷⁰²¹ is an apocalyptic number.

It is an amenable number.

407021 is a deficient number, since it is larger than the sum of its proper divisors (2323).

407021 is a wasteful number, since it uses less digits than its factorization.

407021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 407021 is about 637.9819746670. The cubic root of 407021 is about 74.1092251162.

Adding to 407021 its reverse (120704), we get a palindrome (527725).

The spelling of 407021 in words is "four hundred seven thousand, twenty-one", and thus it is an iban number.