145187440 has 20 divisors (see below), whose sum is σ = 337560984. Its totient is φ = 58074944.

The previous prime is 145187423. The next prime is 145187443. The reversal of 145187440 is 44781541.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 145187396 and 145187405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145187443) 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, 907342 + ... + 907501.

Almost surely, 2^145187440 is an apocalyptic number.

145187440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145187440 is an abundant number, since it is smaller than the sum of its proper divisors (192373544).

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

145187440 is a wasteful number, since it uses less digits than its factorization.

145187440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814856 (or 1814850 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 145187440 is about 12049.3750875305. The cubic root of 145187440 is about 525.5850650648.

The spelling of 145187440 in words is "one hundred forty-five million, one hundred eighty-seven thousand, four hundred forty".