121388392 has 8 divisors (see below), whose sum is σ = 227603250. Its totient is φ = 60694192.

The previous prime is 121388387. The next prime is 121388401. The reversal of 121388392 is 293883121.

It can be written as a sum of positive squares in only one way, i.e., 117202276 + 4186116 = 10826^2 + 2046^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7586767 + ... + 7586782.

Almost surely, 2^121388392 is an apocalyptic number.

It is an amenable number.

121388392 is a deficient number, since it is larger than the sum of its proper divisors (106214858).

121388392 is a wasteful number, since it uses less digits than its factorization.

121388392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15173555 (or 15173551 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 121388392 is about 11017.6400376850. The cubic root of 121388392 is about 495.1373859377.

The spelling of 121388392 in words is "one hundred twenty-one million, three hundred eighty-eight thousand, three hundred ninety-two".