145471540 has 24 divisors (see below), whose sum is σ = 316025640. Its totient is φ = 56181888.

The previous prime is 145471517. The next prime is 145471549. The reversal of 145471540 is 45174541.

It can be written as a sum of positive squares in 4 ways, for example, as 49196196 + 96275344 = 7014^2 + 9812^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145471549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124827 + ... + 125986.

It is an arithmetic number, because the mean of its divisors is an integer number (13167735).

Almost surely, 2^145471540 is an apocalyptic number.

145471540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145471540 is an abundant number, since it is smaller than the sum of its proper divisors (170554100).

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

145471540 is a wasteful number, since it uses less digits than its factorization.

145471540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250851 (or 250849 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 145471540 is about 12061.1583191665. The cubic root of 145471540 is about 525.9276599616.

The spelling of 145471540 in words is "one hundred forty-five million, four hundred seventy-one thousand, five hundred forty".