1200623640 has 128 divisors (see below), whose sum is σ = 3902722560. Its totient is φ = 294303744.

The previous prime is 1200623629. The next prime is 1200623647. The reversal of 1200623640 is 463260021.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1200623640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200623647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80877 + ... + 94563.

It is an arithmetic number, because the mean of its divisors is an integer number (30490020).

Almost surely, 2^1200623640 is an apocalyptic number.

1200623640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1200623640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1951361280).

1200623640 is an abundant number, since it is smaller than the sum of its proper divisors (2702098920).

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

1200623640 is a wasteful number, since it uses less digits than its factorization.

1200623640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13761 (or 13757 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 1200623640 is about 34650.0164502125. The cubic root of 1200623640 is about 1062.8426251878.

Adding to 1200623640 its reverse (463260021), we get a palindrome (1663883661).

The spelling of 1200623640 in words is "one billion, two hundred million, six hundred twenty-three thousand, six hundred forty".