Search a number
12400002 = 232688889
BaseRepresentation
bin101111010011…
…010110000010
3212022222121100
4233103112002
511133300002
61121435230
7210253416
oct57232602
925288540
1012400002
116aaa33a
12419bb16
1327520a4
15114e11c
hexbd3582

12400002 has 12 divisors (see below), whose sum is σ = 26866710. Its totient is φ = 4133328.

The previous prime is 12400001. The next prime is 12400009. The reversal of 12400002 is 20000421.

12400002 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12383361 + 16641 = 3519^2 + 129^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (12400001) 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, 344427 + ... + 344462.

Almost surely, 212400002 is an apocalyptic number.

12400002 is an abundant number, since it is smaller than the sum of its proper divisors (14466708).

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

12400002 is a wasteful number, since it uses less digits than its factorization.

12400002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688897 (or 688894 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 12400002 is about 3521.3636563127. The cubic root of 12400002 is about 231.4589178966.

Adding to 12400002 its reverse (20000421), we get a palindrome (32400423).

The spelling of 12400002 in words is "twelve million, four hundred thousand, two".