402011 has 4 divisors (see below), whose sum is σ = 407592. Its totient is φ = 396432.

The previous prime is 401993. The next prime is 402023. The reversal of 402011 is 110204.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402011 is a prime.

It is a super-2 number, since 2×402011² = 323225688242, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402011.

It is not an unprimeable number, because it can be changed into a prime (402071) 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, 2681 + ... + 2826.

It is an arithmetic number, because the mean of its divisors is an integer number (101898).

2⁴⁰²⁰¹¹ is an apocalyptic number.

402011 is a deficient number, since it is larger than the sum of its proper divisors (5581).

402011 is an equidigital number, since it uses as much as digits as its factorization.

402011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5580.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 402011 is about 634.0433739106. The cubic root of 402011 is about 73.8039000786.

Adding to 402011 its reverse (110204), we get a palindrome (512215).

The spelling of 402011 in words is "four hundred two thousand, eleven", and thus it is an iban number.