921145240 has 16 divisors (see below), whose sum is σ = 2072576880. Its totient is φ = 368458080.

The previous prime is 921145223. The next prime is 921145243. The reversal of 921145240 is 42541129.

It is a junction number, because it is equal to n+sod(n) for n = 921145199 and 921145208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921145243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11514276 + ... + 11514355.

It is an arithmetic number, because the mean of its divisors is an integer number (129536055).

Almost surely, 2^921145240 is an apocalyptic number.

It is an amenable number.

921145240 is an abundant number, since it is smaller than the sum of its proper divisors (1151431640).

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

921145240 is a wasteful number, since it uses less digits than its factorization.

921145240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23028642 (or 23028638 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 921145240 is about 30350.3746270124. The cubic root of 921145240 is about 972.9922268582.

Adding to 921145240 its reverse (42541129), we get a palindrome (963686369).

The spelling of 921145240 in words is "nine hundred twenty-one million, one hundred forty-five thousand, two hundred forty".