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1990216 = 231931289
BaseRepresentation
bin111100101111001001000
310202010001201
413211321020
51002141331
6110353544
722626244
oct7457110
93663051
101990216
11113a308
127bb8b4
13548b57
1439b424
15294a61
hex1e5e48

1990216 has 16 divisors (see below), whose sum is σ = 3753900. Its totient is φ = 989184.

The previous prime is 1990211. The next prime is 1990223. The reversal of 1990216 is 6120991.

It can be written as a sum of positive squares in 2 ways, for example, as 1988100 + 2116 = 1410^2 + 46^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990211) by changing a digit.

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, 900 + ... + 2188.

21990216 is an apocalyptic number.

It is an amenable number.

1990216 is a deficient number, since it is larger than the sum of its proper divisors (1763684).

1990216 is a wasteful number, since it uses less digits than its factorization.

1990216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488 (or 1484 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 1990216 is about 1410.7501550594. The cubic root of 1990216 is about 125.7863179278.

The spelling of 1990216 in words is "one million, nine hundred ninety thousand, two hundred sixteen".

Divisors: 1 2 4 8 193 386 772 1289 1544 2578 5156 10312 248777 497554 995108 1990216