102400489 has 2 divisors, whose sum is σ = 102400490. Its totient is φ = 102400488.

The previous prime is 102400433. The next prime is 102400523. The reversal of 102400489 is 984004201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82446400 + 19954089 = 9080^2 + 4467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102400489 is a prime.

It is not a weakly prime, because it can be changed into another prime (102400889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51200244 + 51200245.

It is an arithmetic number, because the mean of its divisors is an integer number (51200245).

Almost surely, 2^102400489 is an apocalyptic number.

It is an amenable number.

102400489 is a deficient number, since it is larger than the sum of its proper divisors (1).

102400489 is an equidigital number, since it uses as much as digits as its factorization.

102400489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 102400489 is about 10119.3126742877. The cubic root of 102400489 is about 467.8435828236.

The spelling of 102400489 in words is "one hundred two million, four hundred thousand, four hundred eighty-nine".