1621674 has 32 divisors (see below), whose sum is σ = 3672000. Its totient is φ = 530352.

The previous prime is 1621667. The next prime is 1621679. The reversal of 1621674 is 4761261.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1621679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2932 + ... + 3440.

It is an arithmetic number, because the mean of its divisors is an integer number (114750).

2^1621674 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621674, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1836000).

1621674 is an abundant number, since it is smaller than the sum of its proper divisors (2050326).

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

1621674 is a wasteful number, since it uses less digits than its factorization.

1621674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579 (or 573 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 1621674 is about 1273.4496456476. The cubic root of 1621674 is about 117.4864689413.

It can be divided in two parts, 16216 and 74, that added together give a triangular number (16290 = T₁₈₀).

The spelling of 1621674 in words is "one million, six hundred twenty-one thousand, six hundred seventy-four".