402422420 has 12 divisors (see below), whose sum is σ = 845087124. Its totient is φ = 160968960.

The previous prime is 402422417. The next prime is 402422443. The reversal of 402422420 is 24224204.

It can be written as a sum of positive squares in 2 ways, for example, as 63936016 + 338486404 = 7996^2 + 18398^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 20121121 = 402422420 / (4 + 0 + 2 + 4 + 2 + 2 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 402422392 and 402422401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10060541 + ... + 10060580.

It is an arithmetic number, because the mean of its divisors is an integer number (70423927).

Almost surely, 2^402422420 is an apocalyptic number.

It is an amenable number.

402422420 is an abundant number, since it is smaller than the sum of its proper divisors (442664704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402422420 is a wasteful number, since it uses less digits than its factorization.

402422420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20121130 (or 20121128 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 402422420 is about 20060.4690872372. The cubic root of 402422420 is about 738.2906858402.

Adding to 402422420 its reverse (24224204), we get a palindrome (426646624).

The spelling of 402422420 in words is "four hundred two million, four hundred twenty-two thousand, four hundred twenty".