1200040440 has 64 divisors (see below), whose sum is σ = 3608064000. Its totient is φ = 319304832.

The previous prime is 1200040409. The next prime is 1200040441. The reversal of 1200040440 is 440400021.

1200040440 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200040441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44761 + ... + 66359.

It is an arithmetic number, because the mean of its divisors is an integer number (56376000).

Almost surely, 2^1200040440 is an apocalyptic number.

1200040440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200040440 is an abundant number, since it is smaller than the sum of its proper divisors (2408023560).

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

1200040440 is a wasteful number, since it uses less digits than its factorization.

1200040440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22076 (or 22072 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 1200040440 is about 34641.5998475821. The cubic root of 1200040440 is about 1062.6705062464.

Adding to 1200040440 its reverse (440400021), we get a palindrome (1640440461).

The spelling of 1200040440 in words is "one billion, two hundred million, forty thousand, four hundred forty".