16507397 has 2 divisors, whose sum is σ = 16507398. Its totient is φ = 16507396.

The previous prime is 16507373. The next prime is 16507457. The reversal of 16507397 is 79370561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14984641 + 1522756 = 3871^2 + 1234^2 .

It is a cyclic number.

It is not a de Polignac number, because 16507397 - 2¹² = 16503301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16507397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16500397) 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 as a sum of consecutive naturals, namely, 8253698 + 8253699.

It is an arithmetic number, because the mean of its divisors is an integer number (8253699).

Almost surely, 2^16507397 is an apocalyptic number.

It is an amenable number.

16507397 is a deficient number, since it is larger than the sum of its proper divisors (1).

16507397 is an equidigital number, since it uses as much as digits as its factorization.

16507397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39690, while the sum is 38.

The square root of 16507397 is about 4062.9296080538. The cubic root of 16507397 is about 254.6202061186.

The spelling of 16507397 in words is "sixteen million, five hundred seven thousand, three hundred ninety-seven".