402401620 has 12 divisors (see below), whose sum is σ = 845043444. Its totient is φ = 160960640.

The previous prime is 402401609. The next prime is 402401621. The reversal of 402401620 is 26104204.

402401620 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 159415876 + 242985744 = 12626^2 + 15588^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402401621) 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, 10060021 + ... + 10060060.

It is an arithmetic number, because the mean of its divisors is an integer number (70420287).

Almost surely, 2^402401620 is an apocalyptic number.

It is an amenable number.

402401620 is an abundant number, since it is smaller than the sum of its proper divisors (442641824).

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

402401620 is a wasteful number, since it uses less digits than its factorization.

402401620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20120090 (or 20120088 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 402401620 is about 20059.9506479951. The cubic root of 402401620 is about 738.2779656155.

Adding to 402401620 its reverse (26104204), we get a palindrome (428505824).

It can be divided in two parts, 4024016 and 20, that added together give a square (4024036 = 2006²).

The spelling of 402401620 in words is "four hundred two million, four hundred one thousand, six hundred twenty".