153115440 has 80 divisors (see below), whose sum is σ = 475871328. Its totient is φ = 40726528.

The previous prime is 153115411. The next prime is 153115441. The reversal of 153115440 is 44511351.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 153115440.

It is not an unprimeable number, because it can be changed into a prime (153115441) 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, 156232 + ... + 157208.

Almost surely, 2^153115440 is an apocalyptic number.

153115440 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 153115440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237935664).

153115440 is an abundant number, since it is smaller than the sum of its proper divisors (322755888).

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

153115440 is a wasteful number, since it uses less digits than its factorization.

153115440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646 (or 1640 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 153115440 is about 12373.9823824022. The cubic root of 153115440 is about 534.9826063580.

Adding to 153115440 its reverse (44511351), we get a palindrome (197626791).

The spelling of 153115440 in words is "one hundred fifty-three million, one hundred fifteen thousand, four hundred forty".