1660402 has 12 divisors (see below), whose sum is σ = 2555550. Its totient is φ = 809088.

The previous prime is 1660387. The next prime is 1660409. The reversal of 1660402 is 2040661.

It can be written as a sum of positive squares in only one way, i.e., 1347921 + 312481 = 1161^2 + 559^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1660402.

It is not an unprimeable number, because it can be changed into a prime (1660409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3474 + ... + 3922.

2^1660402 is an apocalyptic number.

1660402 is a deficient number, since it is larger than the sum of its proper divisors (895148).

1660402 is an equidigital number, since it uses as much as digits as its factorization.

1660402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1660402 is about 1288.5658694844. The cubic root of 1660402 is about 118.4143719619.

The spelling of 1660402 in words is "one million, six hundred sixty thousand, four hundred two".