1661902 has 8 divisors (see below), whose sum is σ = 2719512. Its totient is φ = 755400.

The previous prime is 1661899. The next prime is 1661917. The reversal of 1661902 is 2091661.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37749 + ... + 37792.

It is an arithmetic number, because the mean of its divisors is an integer number (339939).

2^1661902 is an apocalyptic number.

1661902 is a deficient number, since it is larger than the sum of its proper divisors (1057610).

1661902 is a wasteful number, since it uses less digits than its factorization.

1661902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75554.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1661902 is about 1289.1477805124. The cubic root of 1661902 is about 118.4500195736.

The spelling of 1661902 in words is "one million, six hundred sixty-one thousand, nine hundred two".