1111245720 has 128 divisors (see below), whose sum is σ = 3598741440. Its totient is φ = 272885760.

The previous prime is 1111245701. The next prime is 1111245721. The reversal of 1111245720 is 275421111.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111245721) 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, 1180450 + ... + 1181390.

Almost surely, 2^1111245720 is an apocalyptic number.

1111245720 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 1111245720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1799370720).

1111245720 is an abundant number, since it is smaller than the sum of its proper divisors (2487495720).

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

1111245720 is a wasteful number, since it uses less digits than its factorization.

1111245720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1725 (or 1721 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 1111245720 is about 33335.3524055169. The cubic root of 1111245720 is about 1035.7859930739.

Adding to 1111245720 its reverse (275421111), we get a palindrome (1386666831).

It can be divided in two parts, 111 and 1245720, that added together give a triangular number (1245831 = T₁₅₇₈).

The spelling of 1111245720 in words is "one billion, one hundred eleven million, two hundred forty-five thousand, seven hundred twenty".