106403989 has 2 divisors, whose sum is σ = 106403990. Its totient is φ = 106403988.

The previous prime is 106403981. The next prime is 106404007. The reversal of 106403989 is 989304601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88679889 + 17724100 = 9417^2 + 4210^2 .

It is a cyclic number.

It is not a de Polignac number, because 106403989 - 2³ = 106403981 is a prime.

It is a super-2 number, since 2×106403989² = 22643617750224242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (106403981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53201994 + 53201995.

It is an arithmetic number, because the mean of its divisors is an integer number (53201995).

Almost surely, 2^106403989 is an apocalyptic number.

It is an amenable number.

106403989 is a deficient number, since it is larger than the sum of its proper divisors (1).

106403989 is an equidigital number, since it uses as much as digits as its factorization.

106403989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 106403989 is about 10315.2309232513. The cubic root of 106403989 is about 473.8628220841.

The spelling of 106403989 in words is "one hundred six million, four hundred three thousand, nine hundred eighty-nine".