121254640 has 80 divisors (see below), whose sum is σ = 313479936. Its totient is φ = 43315200.

The previous prime is 121254629. The next prime is 121254649. The reversal of 121254640 is 46452121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121254649) 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, 30360 + ... + 34120.

Almost surely, 2^121254640 is an apocalyptic number.

121254640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121254640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156739968).

121254640 is an abundant number, since it is smaller than the sum of its proper divisors (192225296).

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

121254640 is a wasteful number, since it uses less digits than its factorization.

121254640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3818 (or 3812 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 121254640 is about 11011.5684623036. The cubic root of 121254640 is about 494.9554631222.

The spelling of 121254640 in words is "one hundred twenty-one million, two hundred fifty-four thousand, six hundred forty".