1405660 has 24 divisors (see below), whose sum is σ = 2998800. Its totient is φ = 553344.

The previous prime is 1405643. The next prime is 1405669. The reversal of 1405660 is 665041.

1405660 = T₂₉₁ + T₂₉₂ + ... + T₃₂₀.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 816 + ... + 1864.

It is an arithmetic number, because the mean of its divisors is an integer number (124950).

2^1405660 is an apocalyptic number.

1405660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1405660 is an abundant number, since it is smaller than the sum of its proper divisors (1593140).

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

1405660 is a wasteful number, since it uses less digits than its factorization.

1405660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125 (or 1123 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1405660 is about 1185.6053306223. The cubic root of 1405660 is about 112.0194481534.

The spelling of 1405660 in words is "one million, four hundred five thousand, six hundred sixty".