16390777 has 4 divisors (see below), whose sum is σ = 17651620. Its totient is φ = 15129936.

The previous prime is 16390753. The next prime is 16390799. The reversal of 16390777 is 77709361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77709361 = 37 ⋅2100253.

It can be written as a sum of positive squares in 2 ways, for example, as 7974976 + 8415801 = 2824^2 + 2901^2 .

It is a cyclic number.

It is not a de Polignac number, because 16390777 - 2¹⁵ = 16358009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16390177) 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, 630402 + ... + 630427.

It is an arithmetic number, because the mean of its divisors is an integer number (4412905).

Almost surely, 2^16390777 is an apocalyptic number.

It is an amenable number.

16390777 is a deficient number, since it is larger than the sum of its proper divisors (1260843).

16390777 is a wasteful number, since it uses less digits than its factorization.

16390777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260842.

The product of its (nonzero) digits is 55566, while the sum is 40.

The square root of 16390777 is about 4048.5524573605. The cubic root of 16390777 is about 254.0191824230.

The spelling of 16390777 in words is "sixteen million, three hundred ninety thousand, seven hundred seventy-seven".