2621629 has 4 divisors (see below), whose sum is σ = 2712060. Its totient is φ = 2531200.

The previous prime is 2621617. The next prime is 2621669. The reversal of 2621629 is 9261262.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 996004 + 1625625 = 998^2 + 1275^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621629 - 2⁷ = 2621501 is a prime.

It is a super-2 number, since 2×2621629² = 13745877227282, which contains 22 as substring.

It is a Duffinian number.

2621629 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2621597 and 2621606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621669) 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, 45172 + ... + 45229.

It is an arithmetic number, because the mean of its divisors is an integer number (678015).

2^2621629 is an apocalyptic number.

2621629 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2621629 is a deficient number, since it is larger than the sum of its proper divisors (90431).

2621629 is an equidigital number, since it uses as much as digits as its factorization.

2621629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90430.

The product of its digits is 2592, while the sum is 28.

The square root of 2621629 is about 1619.1445272118. The cubic root of 2621629 is about 137.8871337881.

It can be divided in two parts, 262 and 1629, that added together give a triangular number (1891 = T₆₁).

The spelling of 2621629 in words is "two million, six hundred twenty-one thousand, six hundred twenty-nine".