30420989 has 2 divisors, whose sum is σ = 30420990. Its totient is φ = 30420988.

The previous prime is 30420983. The next prime is 30421003. The reversal of 30420989 is 98902403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29888089 + 532900 = 5467^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 30420989 - 2¹⁶ = 30355453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30420983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15210494 + 15210495.

It is an arithmetic number, because the mean of its divisors is an integer number (15210495).

Almost surely, 2^30420989 is an apocalyptic number.

It is an amenable number.

30420989 is a deficient number, since it is larger than the sum of its proper divisors (1).

30420989 is an equidigital number, since it uses as much as digits as its factorization.

30420989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 30420989 is about 5515.5225500400. The cubic root of 30420989 is about 312.1699606797.

The spelling of 30420989 in words is "thirty million, four hundred twenty thousand, nine hundred eighty-nine".