16397777 has 8 divisors (see below), whose sum is σ = 17931072. Its totient is φ = 14871600.

The previous prime is 16397767. The next prime is 16397803. The reversal of 16397777 is 77779361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16397777 - 2⁴ = 16397761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16397737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3827 + ... + 6887.

It is an arithmetic number, because the mean of its divisors is an integer number (2241384).

Almost surely, 2^16397777 is an apocalyptic number.

It is an amenable number.

16397777 is a deficient number, since it is larger than the sum of its proper divisors (1533295).

16397777 is a wasteful number, since it uses less digits than its factorization.

16397777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3559.

The product of its digits is 388962, while the sum is 47.

The square root of 16397777 is about 4049.4168716002. The cubic root of 16397777 is about 254.0553385533.

It can be divided in two parts, 16 and 397777, that added together give a palindrome (397793).

The spelling of 16397777 in words is "sixteen million, three hundred ninety-seven thousand, seven hundred seventy-seven".