1605402 has 12 divisors (see below), whose sum is σ = 3478410. Its totient is φ = 535128.

The previous prime is 1605389. The next prime is 1605413. The reversal of 1605402 is 2045061.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1565001 + 40401 = 1251^2 + 201^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 89189 = 1605402 / (1 + 6 + 0 + 5 + 4 + 0 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44577 + ... + 44612.

2^1605402 is an apocalyptic number.

1605402 is an abundant number, since it is smaller than the sum of its proper divisors (1873008).

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

1605402 is a wasteful number, since it uses less digits than its factorization.

1605402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89197 (or 89194 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1605402 is about 1267.0445927433. The cubic root of 1605402 is about 117.0921911995.

The spelling of 1605402 in words is "one million, six hundred five thousand, four hundred two".