1630397 has 4 divisors (see below), whose sum is σ = 1638336. Its totient is φ = 1622460.
The previous prime is 1630393. The next prime is 1630399. The reversal of 1630397 is 7930361.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 1630397 - 22 = 1630393 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1630393) 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, 3653 + ... + 4074.
It is an arithmetic number, because the mean of its divisors is an integer number (409584).
21630397 is an apocalyptic number.
It is an amenable number.
1630397 is a deficient number, since it is larger than the sum of its proper divisors (7939).
1630397 is an equidigital number, since it uses as much as digits as its factorization.
1630397 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 7938.
The product of its (nonzero) digits is 3402, while the sum is 29.
The square root of 1630397 is about 1276.8700012139. The cubic root of 1630397 is about 117.6967459778.
The spelling of 1630397 in words is "one million, six hundred thirty thousand, three hundred ninety-seven".
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