402019 has 4 divisors (see below), whose sum is σ = 404296. Its totient is φ = 399744.

The previous prime is 401993. The next prime is 402023. The reversal of 402019 is 910204.

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

It is a cyclic number.

It is not a de Polignac number, because 402019 - 2⁵ = 401987 is a prime.

It is a super-2 number, since 2×402019² = 323238552722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401993 and 402011.

It is not an unprimeable number, because it can be changed into a prime (402029) 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, 849 + ... + 1234.

It is an arithmetic number, because the mean of its divisors is an integer number (101074).

2⁴⁰²⁰¹⁹ is an apocalyptic number.

402019 is a deficient number, since it is larger than the sum of its proper divisors (2277).

402019 is a wasteful number, since it uses less digits than its factorization.

402019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 402019 is about 634.0496825959. The cubic root of 402019 is about 73.8043896401.

The spelling of 402019 in words is "four hundred two thousand, nineteen".