402034421 has 2 divisors, whose sum is σ = 402034422. Its totient is φ = 402034420.

The previous prime is 402034403. The next prime is 402034427. The reversal of 402034421 is 124430204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 327211921 + 74822500 = 18089^2 + 8650^2 .

It is a cyclic number.

It is not a de Polignac number, because 402034421 - 2¹⁰ = 402033397 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 402034393 and 402034402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402034427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201017210 + 201017211.

It is an arithmetic number, because the mean of its divisors is an integer number (201017211).

Almost surely, 2^402034421 is an apocalyptic number.

It is an amenable number.

402034421 is a deficient number, since it is larger than the sum of its proper divisors (1).

402034421 is an equidigital number, since it uses as much as digits as its factorization.

402034421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 402034421 is about 20050.7960191111. The cubic root of 402034421 is about 738.0533331267.

Adding to 402034421 its reverse (124430204), we get a palindrome (526464625).

The spelling of 402034421 in words is "four hundred two million, thirty-four thousand, four hundred twenty-one".