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16397409 = 372331337
BaseRepresentation
bin111110100011…
…010001100001
31010212002000110
4332203101201
513144204114
61343241533
7256242600
oct76432141
933762013
1016397409
11928a686
1255a92a9
133521712
14226ba37
15168d759
hexfa3461

16397409 has 24 divisors (see below), whose sum is σ = 25585248. Its totient is φ = 9313920.

The previous prime is 16397389. The next prime is 16397411. The reversal of 16397409 is 90479361.

16397409 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16397409 - 27 = 16397281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16397009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48489 + ... + 48825.

It is an arithmetic number, because the mean of its divisors is an integer number (1066052).

Almost surely, 216397409 is an apocalyptic number.

It is an amenable number.

16397409 is a deficient number, since it is larger than the sum of its proper divisors (9187839).

16397409 is a wasteful number, since it uses less digits than its factorization.

16397409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 16397409 is about 4049.3714327041. The cubic root of 16397409 is about 254.0534380302.

The spelling of 16397409 in words is "sixteen million, three hundred ninety-seven thousand, four hundred nine".

Divisors: 1 3 7 21 49 147 331 337 993 1011 2317 2359 6951 7077 16219 16513 48657 49539 111547 334641 780829 2342487 5465803 16397409