1445885840 has 40 divisors (see below), whose sum is σ = 3841926720. Its totient is φ = 495732096.

The previous prime is 1445885827. The next prime is 1445885843. The reversal of 1445885840 is 485885441.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (1445885843) 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, 1290410 + ... + 1291529.

It is an arithmetic number, because the mean of its divisors is an integer number (96048168).

Almost surely, 2^1445885840 is an apocalyptic number.

1445885840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1445885840 is an abundant number, since it is smaller than the sum of its proper divisors (2396040880).

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

1445885840 is a wasteful number, since it uses less digits than its factorization.

1445885840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581959 (or 2581953 counting only the distinct ones).

The product of its (nonzero) digits is 819200, while the sum is 47.

The square root of 1445885840 is about 38024.8055879317. The cubic root of 1445885840 is about 1130.7796952675.

The spelling of 1445885840 in words is "one billion, four hundred forty-five million, eight hundred eighty-five thousand, eight hundred forty".