121593978 has 48 divisors (see below), whose sum is σ = 292851936. Its totient is φ = 36148320.

The previous prime is 121593973. The next prime is 121594007. The reversal of 121593978 is 879395121.

It is a super-3 number, since 3×121593978³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (121593971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4701 + ... + 16287.

It is an arithmetic number, because the mean of its divisors is an integer number (6101082).

Almost surely, 2^121593978 is an apocalyptic number.

121593978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121593978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146425968).

121593978 is an abundant number, since it is smaller than the sum of its proper divisors (171257958).

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

121593978 is a wasteful number, since it uses less digits than its factorization.

121593978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11659 (or 11656 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 121593978 is about 11026.9659471679. The cubic root of 121593978 is about 495.4167534031.

The spelling of 121593978 in words is "one hundred twenty-one million, five hundred ninety-three thousand, nine hundred seventy-eight".