121407389 has 2 divisors, whose sum is σ = 121407390. Its totient is φ = 121407388.

The previous prime is 121407367. The next prime is 121407401. The reversal of 121407389 is 983704121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119530489 + 1876900 = 10933^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 121407389 - 2¹⁶ = 121341853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121407329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60703694 + 60703695.

It is an arithmetic number, because the mean of its divisors is an integer number (60703695).

Almost surely, 2^121407389 is an apocalyptic number.

It is an amenable number.

121407389 is a deficient number, since it is larger than the sum of its proper divisors (1).

121407389 is an equidigital number, since it uses as much as digits as its factorization.

121407389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 121407389 is about 11018.5021214319. The cubic root of 121407389 is about 495.1632138722.

The spelling of 121407389 in words is "one hundred twenty-one million, four hundred seven thousand, three hundred eighty-nine".