121428489 has 16 divisors (see below), whose sum is σ = 199267712. Its totient is φ = 64050048.

The previous prime is 121428469. The next prime is 121428497. The reversal of 121428489 is 984824121.

It is not a de Polignac number, because 121428489 - 2⁸ = 121428233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (121428469) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222124 + ... + 222669.

It is an arithmetic number, because the mean of its divisors is an integer number (12454232).

Almost surely, 2^121428489 is an apocalyptic number.

It is an amenable number.

121428489 is a deficient number, since it is larger than the sum of its proper divisors (77839223).

121428489 is a wasteful number, since it uses less digits than its factorization.

121428489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444816.

The product of its digits is 36864, while the sum is 39.

The square root of 121428489 is about 11019.4595602507. The cubic root of 121428489 is about 495.1918978446.

The spelling of 121428489 in words is "one hundred twenty-one million, four hundred twenty-eight thousand, four hundred eighty-nine".