1244555740 has 12 divisors (see below), whose sum is σ = 2613567096. Its totient is φ = 497822288.

The previous prime is 1244555623. The next prime is 1244555743. The reversal of 1244555740 is 475554421.

It is a self number, because there is not a number n which added to its sum of digits gives 1244555740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244555743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31113874 + ... + 31113913.

It is an arithmetic number, because the mean of its divisors is an integer number (217797258).

Almost surely, 2^1244555740 is an apocalyptic number.

1244555740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1244555740 is an abundant number, since it is smaller than the sum of its proper divisors (1369011356).

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

1244555740 is a wasteful number, since it uses less digits than its factorization.

1244555740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62227796 (or 62227794 counting only the distinct ones).

The product of its (nonzero) digits is 112000, while the sum is 37.

The square root of 1244555740 is about 35278.2615784848. The cubic root of 1244555740 is about 1075.6511620077.

The spelling of 1244555740 in words is "one billion, two hundred forty-four million, five hundred fifty-five thousand, seven hundred forty".