1153122640 has 40 divisors (see below), whose sum is σ = 2688801120. Its totient is φ = 459908736.

The previous prime is 1153122623. The next prime is 1153122647. The reversal of 1153122640 is 462213511.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1153122647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6991 + ... + 48529.

It is an arithmetic number, because the mean of its divisors is an integer number (67220028).

Almost surely, 2^1153122640 is an apocalyptic number.

1153122640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1153122640 is an abundant number, since it is smaller than the sum of its proper divisors (1535678480).

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

1153122640 is a wasteful number, since it uses less digits than its factorization.

1153122640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41899 (or 41893 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1153122640 is about 33957.6595188773. The cubic root of 1153122640 is about 1048.6369736458.

The spelling of 1153122640 in words is "one billion, one hundred fifty-three million, one hundred twenty-two thousand, six hundred forty".