145515540 has 24 divisors (see below), whose sum is σ = 407443680. Its totient is φ = 38804128.

The previous prime is 145515497. The next prime is 145515553. The reversal of 145515540 is 45515541.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 145515498 and 145515507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1212570 + ... + 1212689.

It is an arithmetic number, because the mean of its divisors is an integer number (16976820).

Almost surely, 2^145515540 is an apocalyptic number.

145515540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145515540 is an abundant number, since it is smaller than the sum of its proper divisors (261928140).

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

145515540 is a wasteful number, since it uses less digits than its factorization.

145515540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425271 (or 2425269 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 145515540 is about 12062.9822183405. The cubic root of 145515540 is about 525.9806794602.

Subtracting from 145515540 its reverse (45515541), we obtain a palindrome (99999999).

The spelling of 145515540 in words is "one hundred forty-five million, five hundred fifteen thousand, five hundred forty".