1901666 has 8 divisors (see below), whose sum is σ = 3071964. Its totient is φ = 877680.

The previous prime is 1901651. The next prime is 1901681. The reversal of 1901666 is 6661091.

It is an interprime number because it is at equal distance from previous prime (1901651) and next prime (1901681).

It can be written as a sum of positive squares in 2 ways, for example, as 1901641 + 25 = 1379^2 + 5^2 .

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, 36545 + ... + 36596.

2^1901666 is an apocalyptic number.

1901666 is a deficient number, since it is larger than the sum of its proper divisors (1170298).

1901666 is a wasteful number, since it uses less digits than its factorization.

1901666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73156.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1901666 is about 1379.0090645097. The cubic root of 1901666 is about 123.8924231741.

The spelling of 1901666 in words is "one million, nine hundred one thousand, six hundred sixty-six".