1237991040 has 640 divisors, whose sum is σ = 5225109120. Its totient is φ = 275374080.

The previous prime is 1237991011. The next prime is 1237991087. The reversal of 1237991040 is 401997321.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1237990986 and 1237991004.

It is a congruent number.

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 7413037 + ... + 7413203.

It is an arithmetic number, because the mean of its divisors is an integer number (8164233).

Almost surely, 2^1237991040 is an apocalyptic number.

1237991040 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 1237991040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2612554560).

1237991040 is an abundant number, since it is smaller than the sum of its proper divisors (3987118080).

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

1237991040 is a wasteful number, since it uses less digits than its factorization.

1237991040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 1237991040 is about 35185.0968451133. The cubic root of 1237991040 is about 1073.7565691537.

The spelling of 1237991040 in words is "one billion, two hundred thirty-seven million, nine hundred ninety-one thousand, forty".