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1972730 = 25197273
BaseRepresentation
bin111100001100111111010
310201020002002
413201213322
51001111410
6110141002
722524254
oct7414772
93636062
101972730
111128161
127b1762
13540bc6
14394cd4
1528e7a5
hex1e19fa

1972730 has 8 divisors (see below), whose sum is σ = 3550932. Its totient is φ = 789088.

The previous prime is 1972721. The next prime is 1972739. The reversal of 1972730 is 372791.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1972721) and next prime (1972739).

It can be written as a sum of positive squares in 2 ways, for example, as 1852321 + 120409 = 1361^2 + 347^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1972693 and 1972702.

It is not an unprimeable number, because it can be changed into a prime (1972739) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 98627 + ... + 98646.

21972730 is an apocalyptic number.

1972730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1972730 is a deficient number, since it is larger than the sum of its proper divisors (1578202).

1972730 is a wasteful number, since it uses less digits than its factorization.

1972730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197280.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 1972730 is about 1404.5390703003. The cubic root of 1972730 is about 125.4168483544.

The spelling of 1972730 in words is "one million, nine hundred seventy-two thousand, seven hundred thirty".

Divisors: 1 2 5 10 197273 394546 986365 1972730