1601387 has 4 divisors (see below), whose sum is σ = 1603920. Its totient is φ = 1598856.

The previous prime is 1601381. The next prime is 1601389. The reversal of 1601387 is 7831061.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7831061 = 7 ⋅1118723.

It is a cyclic number.

It is not a de Polignac number, because 1601387 - 2⁴ = 1601371 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578 + ... + 1880.

It is an arithmetic number, because the mean of its divisors is an integer number (400980).

2^1601387 is an apocalyptic number.

1601387 is a deficient number, since it is larger than the sum of its proper divisors (2533).

1601387 is a wasteful number, since it uses less digits than its factorization.

1601387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2532.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 1601387 is about 1265.4592051900. The cubic root of 1601387 is about 116.9944965390.

The spelling of 1601387 in words is "one million, six hundred one thousand, three hundred eighty-seven".