1629645 has 8 divisors (see below), whose sum is σ = 2607456. Its totient is φ = 869136.

The previous prime is 1629643. The next prime is 1629647. The reversal of 1629645 is 5469261.

It is an interprime number because it is at equal distance from previous prime (1629643) and next prime (1629647).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1629645 - 2¹ = 1629643 is a prime.

It is a super-3 number, since 3×1629645³ = 12983754053152533375, which contains 333 as substring.

1629645 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1629643) 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 7 ways as a sum of consecutive naturals, for example, 54307 + ... + 54336.

It is an arithmetic number, because the mean of its divisors is an integer number (325932).

2^1629645 is an apocalyptic number.

1629645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1629645 is a deficient number, since it is larger than the sum of its proper divisors (977811).

1629645 is a wasteful number, since it uses less digits than its factorization.

1629645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108651.

The product of its digits is 12960, while the sum is 33.

The square root of 1629645 is about 1276.5754971799. The cubic root of 1629645 is about 117.6786478164.

The spelling of 1629645 in words is "one million, six hundred twenty-nine thousand, six hundred forty-five".