1401645 has 24 divisors (see below), whose sum is σ = 2610144. Its totient is φ = 640416.

The previous prime is 1401641. The next prime is 1401679. The reversal of 1401645 is 5461041.

It is not a de Polignac number, because 1401645 - 2² = 1401641 is a prime.

It is a super-3 number, since 3×1401645³ = 8261051909269233375, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 219 + ... + 1688.

It is an arithmetic number, because the mean of its divisors is an integer number (108756).

2^1401645 is an apocalyptic number.

1401645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1401645 is a deficient number, since it is larger than the sum of its proper divisors (1208499).

1401645 is a wasteful number, since it uses less digits than its factorization.

1401645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929 (or 1922 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1401645 is about 1183.9108919171. The cubic root of 1401645 is about 111.9126923752.

Adding to 1401645 its reverse (5461041), we get a palindrome (6862686).

The spelling of 1401645 in words is "one million, four hundred one thousand, six hundred forty-five".