1601403 has 4 divisors (see below), whose sum is σ = 2135208. Its totient is φ = 1067600.

The previous prime is 1601399. The next prime is 1601423. The reversal of 1601403 is 3041061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3041061 = 3 ⋅1013687.

It is a cyclic number.

It is not a de Polignac number, because 1601403 - 2² = 1601399 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1601423) 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, 266898 + ... + 266903.

It is an arithmetic number, because the mean of its divisors is an integer number (533802).

2^1601403 is an apocalyptic number.

1601403 is a deficient number, since it is larger than the sum of its proper divisors (533805).

1601403 is an equidigital number, since it uses as much as digits as its factorization.

1601403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533804.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1601403 is about 1265.4655269900. The cubic root of 1601403 is about 116.9948861816.

Adding to 1601403 its reverse (3041061), we get a palindrome (4642464).

The spelling of 1601403 in words is "one million, six hundred one thousand, four hundred three".