99870389 has 2 divisors, whose sum is σ = 99870390. Its totient is φ = 99870388.

The previous prime is 99870367. The next prime is 99870443. The reversal of 99870389 is 98307899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96373489 + 3496900 = 9817^2 + 1870^2 .

It is a cyclic number.

It is not a de Polignac number, because 99870389 - 2²⁰ = 98821813 is a prime.

It is a super-2 number, since 2×99870389² = 19948189198022642, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99870389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99870319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49935194 + 49935195.

It is an arithmetic number, because the mean of its divisors is an integer number (49935195).

Almost surely, 2^99870389 is an apocalyptic number.

It is an amenable number.

99870389 is a deficient number, since it is larger than the sum of its proper divisors (1).

99870389 is an equidigital number, since it uses as much as digits as its factorization.

99870389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 99870389 is about 9993.5173487616. The cubic root of 99870389 is about 463.9582630042.

The spelling of 99870389 in words is "ninety-nine million, eight hundred seventy thousand, three hundred eighty-nine".