1405990 has 16 divisors (see below), whose sum is σ = 2641248. Its totient is φ = 537856.

The previous prime is 1405979. The next prime is 1405997. The reversal of 1405990 is 995041.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405997) 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, 2827 + ... + 3286.

It is an arithmetic number, because the mean of its divisors is an integer number (165078).

2^1405990 is an apocalyptic number.

1405990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1405990 is a deficient number, since it is larger than the sum of its proper divisors (1235258).

1405990 is a wasteful number, since it uses less digits than its factorization.

1405990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6143.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1405990 is about 1185.7444918700. The cubic root of 1405990 is about 112.0282135555.

The spelling of 1405990 in words is "one million, four hundred five thousand, nine hundred ninety".