1440220525 has 12 divisors (see below), whose sum is σ = 1796572512. Its totient is φ = 1145273840.

The previous prime is 1440220499. The next prime is 1440220531. The reversal of 1440220525 is 5250220441.

It is not a de Polignac number, because 1440220525 - 2⁵ = 1440220493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1440220525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168307 + ... + 176656.

It is an arithmetic number, because the mean of its divisors is an integer number (149714376).

Almost surely, 2^1440220525 is an apocalyptic number.

It is an amenable number.

1440220525 is a deficient number, since it is larger than the sum of its proper divisors (356351987).

1440220525 is a wasteful number, since it uses less digits than its factorization.

1440220525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345140 (or 345135 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 1440220525 is about 37950.2374827879. The cubic root of 1440220525 is about 1129.3008767066.

Adding to 1440220525 its reverse (5250220441), we get a palindrome (6690440966).

The spelling of 1440220525 in words is "one billion, four hundred forty million, two hundred twenty thousand, five hundred twenty-five".