1990635 has 8 divisors (see below), whose sum is σ = 3185040. Its totient is φ = 1061664.

The previous prime is 1990621. The next prime is 1990643. The reversal of 1990635 is 5360991.

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

It is not a de Polignac number, because 1990635 - 2⁷ = 1990507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1990596 and 1990605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66340 + ... + 66369.

It is an arithmetic number, because the mean of its divisors is an integer number (398130).

2^1990635 is an apocalyptic number.

1990635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1990635 is a deficient number, since it is larger than the sum of its proper divisors (1194405).

1990635 is a wasteful number, since it uses less digits than its factorization.

1990635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132717.

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 1990635 is about 1410.8986497974. The cubic root of 1990635 is about 125.7951445693.

The spelling of 1990635 in words is "one million, nine hundred ninety thousand, six hundred thirty-five".