1621741 has 8 divisors (see below), whose sum is σ = 1778400. Its totient is φ = 1466640.

The previous prime is 1621729. The next prime is 1621751. The reversal of 1621741 is 1471261.

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

It is a cyclic number.

It is not a de Polignac number, because 1621741 - 2¹⁷ = 1490669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621721) 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, 3975 + ... + 4363.

It is an arithmetic number, because the mean of its divisors is an integer number (222300).

2^1621741 is an apocalyptic number.

1621741 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1621741 is a deficient number, since it is larger than the sum of its proper divisors (156659).

1621741 is a wasteful number, since it uses less digits than its factorization.

1621741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779.

The product of its digits is 336, while the sum is 22.

The square root of 1621741 is about 1273.4759518735. The cubic root of 1621741 is about 117.4880869165.

The spelling of 1621741 in words is "one million, six hundred twenty-one thousand, seven hundred forty-one".