1990402 has 8 divisors (see below), whose sum is σ = 3142800. Its totient is φ = 942804.

The previous prime is 1990381. The next prime is 1990433. The reversal of 1990402 is 2040991.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26152 + ... + 26227.

It is an arithmetic number, because the mean of its divisors is an integer number (392850).

2^1990402 is an apocalyptic number.

1990402 is a deficient number, since it is larger than the sum of its proper divisors (1152398).

1990402 is a wasteful number, since it uses less digits than its factorization.

1990402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52400.

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

The square root of 1990402 is about 1410.8160758937. The cubic root of 1990402 is about 125.7902363511.

The spelling of 1990402 in words is "one million, nine hundred ninety thousand, four hundred two".