16018397 has 4 divisors (see below), whose sum is σ = 16030620. Its totient is φ = 16006176.

The previous prime is 16018393. The next prime is 16018433. The reversal of 16018397 is 79381061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79381061 = 3331 ⋅23831.

It can be written as a sum of positive squares in 2 ways, for example, as 13039321 + 2979076 = 3611^2 + 1726^2 .

It is a cyclic number.

It is not a de Polignac number, because 16018397 - 2² = 16018393 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 (16018391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3872 + ... + 6857.

It is an arithmetic number, because the mean of its divisors is an integer number (4007655).

Almost surely, 2^16018397 is an apocalyptic number.

It is an amenable number.

16018397 is a deficient number, since it is larger than the sum of its proper divisors (12223).

16018397 is a wasteful number, since it uses less digits than its factorization.

16018397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12222.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 16018397 is about 4002.2989643454. The cubic root of 16018397 is about 252.0807511851.

The spelling of 16018397 in words is "sixteen million, eighteen thousand, three hundred ninety-seven".