1990425 has 12 divisors (see below), whose sum is σ = 3290960. Its totient is φ = 1061520.

The previous prime is 1990381. The next prime is 1990433. The reversal of 1990425 is 5240991.

It is a happy number.

It is not a de Polignac number, because 1990425 - 2⁶ = 1990361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1990392 and 1990401.

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 11 ways as a sum of consecutive naturals, for example, 13195 + ... + 13344.

2^1990425 is an apocalyptic number.

1990425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1990425 is a deficient number, since it is larger than the sum of its proper divisors (1300535).

1990425 is a wasteful number, since it uses less digits than its factorization.

1990425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26552 (or 26547 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 1990425 is about 1410.8242271807. The cubic root of 1990425 is about 125.7907208704.

It can be divided in two parts, 1990 and 425, that added together give a triangular number (2415 = T₆₉).

The spelling of 1990425 in words is "one million, nine hundred ninety thousand, four hundred twenty-five".