1405425 has 24 divisors (see below), whose sum is σ = 2656576. Its totient is φ = 642240.

The previous prime is 1405421. The next prime is 1405451. The reversal of 1405425 is 5245041.

It is not a de Polignac number, because 1405425 - 2² = 1405421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

1405425 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1405421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 814 + ... + 1863.

2^1405425 is an apocalyptic number.

1405425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1405425 is a deficient number, since it is larger than the sum of its proper divisors (1251151).

1405425 is a wasteful number, since it uses less digits than its factorization.

1405425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2697 (or 2692 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 1405425 is about 1185.5062209875. The cubic root of 1405425 is about 112.0132052882.

It can be divided in two parts, 1405 and 425, that added together give a triangular number (1830 = T₆₀).

The spelling of 1405425 in words is "one million, four hundred five thousand, four hundred twenty-five".