1645460 has 24 divisors (see below), whose sum is σ = 3575880. Its totient is φ = 635264.

The previous prime is 1645459. The next prime is 1645463. The reversal of 1645460 is 645461.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1936 + 1643524 = 44^2 + 1282^2 .

It is a super-2 number, since 2×1645460² = 5415077223200, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645463) 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, 839 + ... + 1998.

It is an arithmetic number, because the mean of its divisors is an integer number (148995).

2^1645460 is an apocalyptic number.

1645460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645460 is an abundant number, since it is smaller than the sum of its proper divisors (1930420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645460 is a wasteful number, since it uses less digits than its factorization.

1645460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2875 (or 2873 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1645460 is about 1282.7548479737. The cubic root of 1645460 is about 118.0580964518.

Subtracting from 1645460 its reverse (645461), we obtain a palindrome (999999).

The spelling of 1645460 in words is "one million, six hundred forty-five thousand, four hundred sixty".