121397380 has 24 divisors (see below), whose sum is σ = 274545432. Its totient is φ = 44823552.

The previous prime is 121397359. The next prime is 121397399. The reversal of 121397380 is 83793121.

It can be written as a sum of positive squares in 4 ways, for example, as 5447556 + 115949824 = 2334^2 + 10768^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233197 + ... + 233716.

It is an arithmetic number, because the mean of its divisors is an integer number (11439393).

Almost surely, 2^121397380 is an apocalyptic number.

121397380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121397380 is an abundant number, since it is smaller than the sum of its proper divisors (153148052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121397380 is a wasteful number, since it uses less digits than its factorization.

121397380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466935 (or 466933 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 121397380 is about 11018.0479214787. The cubic root of 121397380 is about 495.1496061754.

The spelling of 121397380 in words is "one hundred twenty-one million, three hundred ninety-seven thousand, three hundred eighty".