1663402 has 8 divisors (see below), whose sum is σ = 2687076. Its totient is φ = 767712.

The previous prime is 1663397. The next prime is 1663457. The reversal of 1663402 is 2043661.

It can be written as a sum of positive squares in 2 ways, for example, as 1615441 + 47961 = 1271^2 + 219^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31963 + ... + 32014.

2^1663402 is an apocalyptic number.

1663402 is a deficient number, since it is larger than the sum of its proper divisors (1023674).

1663402 is a wasteful number, since it uses less digits than its factorization.

1663402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63992.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1663402 is about 1289.7294289889. The cubic root of 1663402 is about 118.4856457418.

The spelling of 1663402 in words is "one million, six hundred sixty-three thousand, four hundred two".