402020401 has 4 divisors (see below), whose sum is σ = 402062400. Its totient is φ = 401978404.

The previous prime is 402020393. The next prime is 402020407. The reversal of 402020401 is 104020204.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 402020401 - 2³ = 402020393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402020407) 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, 1140 + ... + 28378.

It is an arithmetic number, because the mean of its divisors is an integer number (100515600).

Almost surely, 2^402020401 is an apocalyptic number.

It is an amenable number.

402020401 is a deficient number, since it is larger than the sum of its proper divisors (41999).

402020401 is a wasteful number, since it uses less digits than its factorization.

402020401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41998.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 402020401 is about 20050.4464040081. The cubic root of 402020401 is about 738.0447537385.

Adding to 402020401 its reverse (104020204), we get a palindrome (506040605).

The spelling of 402020401 in words is "four hundred two million, twenty thousand, four hundred one".