1621010 has 16 divisors (see below), whose sum is σ = 2937816. Its totient is φ = 643968.

The previous prime is 1620989. The next prime is 1621019. The reversal of 1621010 is 101261.

It can be written as a sum of positive squares in 4 ways, for example, as 1247689 + 373321 = 1117^2 + 611^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1620982 and 1621000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621019) 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, 1262 + ... + 2198.

2^1621010 is an apocalyptic number.

1621010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1621010 is a deficient number, since it is larger than the sum of its proper divisors (1316806).

1621010 is a wasteful number, since it uses less digits than its factorization.

1621010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1621010 is about 1273.1889097852. The cubic root of 1621010 is about 117.4704316726.

Adding to 1621010 its reverse (101261), we get a palindrome (1722271).

The spelling of 1621010 in words is "one million, six hundred twenty-one thousand, ten".