16550397 has 6 divisors (see below), whose sum is σ = 23906142. Its totient is φ = 11033592.

The previous prime is 16550393. The next prime is 16550411. The reversal of 16550397 is 79305561.

It is a happy number.

16550397 is a `hidden beast` number, since 1 + 65 + 503 + 97 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10169721 + 6380676 = 3189^2 + 2526^2 .

It is not a de Polignac number, because 16550397 - 2² = 16550393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16550393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 919458 + ... + 919475.

It is an arithmetic number, because the mean of its divisors is an integer number (3984357).

Almost surely, 2^16550397 is an apocalyptic number.

It is an amenable number.

16550397 is a deficient number, since it is larger than the sum of its proper divisors (7355745).

16550397 is a wasteful number, since it uses less digits than its factorization.

16550397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838939 (or 1838936 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 36.

The square root of 16550397 is about 4068.2179145174. The cubic root of 16550397 is about 254.8411005434.

It can be divided in two parts, 165503 and 97, that added together give a triangular number (165600 = T₅₇₅).

The spelling of 16550397 in words is "sixteen million, five hundred fifty thousand, three hundred ninety-seven".