1244406620 has 48 divisors (see below), whose sum is σ = 2642558688. Its totient is φ = 492211200.

The previous prime is 1244406599. The next prime is 1244406629. The reversal of 1244406620 is 266044421.

1244406620 = 470² + 471² + ... + 1565².

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244406629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 856895 + ... + 858345.

It is an arithmetic number, because the mean of its divisors is an integer number (55053306).

Almost surely, 2^1244406620 is an apocalyptic number.

1244406620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1244406620 is an abundant number, since it is smaller than the sum of its proper divisors (1398152068).

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

1244406620 is a wasteful number, since it uses less digits than its factorization.

1244406620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910 (or 1908 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 1244406620 is about 35276.1480323462. The cubic root of 1244406620 is about 1075.6081995532.

The spelling of 1244406620 in words is "one billion, two hundred forty-four million, four hundred six thousand, six hundred twenty".