1145720 has 16 divisors (see below), whose sum is σ = 2577960. Its totient is φ = 458272.

The previous prime is 1145713. The next prime is 1145723. The reversal of 1145720 is 275411.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1145692 and 1145701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145723) 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, 14282 + ... + 14361.

2^1145720 is an apocalyptic number.

1145720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1145720 is an abundant number, since it is smaller than the sum of its proper divisors (1432240).

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

1145720 is a wasteful number, since it uses less digits than its factorization.

1145720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28654 (or 28650 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 1145720 is about 1070.3831089848. The cubic root of 1145720 is about 104.6388194993.

The spelling of 1145720 in words is "one million, one hundred forty-five thousand, seven hundred twenty".