1145840 has 20 divisors (see below), whose sum is σ = 2664264. Its totient is φ = 458304.

The previous prime is 1145831. The next prime is 1145843. The reversal of 1145840 is 485411.

1145840 = T₁₀₄ + T₁₀₅ + ... + T₁₉₉.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145843) 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, 7082 + ... + 7241.

2^1145840 is an apocalyptic number.

1145840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1145840 is an abundant number, since it is smaller than the sum of its proper divisors (1518424).

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

1145840 is a wasteful number, since it uses less digits than its factorization.

1145840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14336 (or 14330 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 1145840 is about 1070.4391622133. The cubic root of 1145840 is about 104.6424725792.

The spelling of 1145840 in words is "one million, one hundred forty-five thousand, eight hundred forty".