402020402 has 12 divisors (see below), whose sum is σ = 701484750. Its totient is φ = 172294416.

The previous prime is 402020393. The next prime is 402020407. The reversal of 402020402 is 204020204.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 352725961 + 49294441 = 18781^2 + 7021^2 .

It is a Harshad number since it is a multiple of its sum of digits (14).

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 5 ways as a sum of consecutive naturals, for example, 2051027 + ... + 2051222.

Almost surely, 2^402020402 is an apocalyptic number.

402020402 is a deficient number, since it is larger than the sum of its proper divisors (299464348).

402020402 is a wasteful number, since it uses less digits than its factorization.

402020402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4102265 (or 4102258 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 402020402 is about 20050.4464289452. The cubic root of 402020402 is about 738.0447543505.

Adding to 402020402 its reverse (204020204), we get a palindrome (606040606).

The spelling of 402020402 in words is "four hundred two million, twenty thousand, four hundred two".