1621954 has 8 divisors (see below), whose sum is σ = 2561040. Its totient is φ = 768276.

The previous prime is 1621933. The next prime is 1621979. The reversal of 1621954 is 4591261.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21304 + ... + 21379.

It is an arithmetic number, because the mean of its divisors is an integer number (320130).

2^1621954 is an apocalyptic number.

1621954 is a deficient number, since it is larger than the sum of its proper divisors (939086).

1621954 is a wasteful number, since it uses less digits than its factorization.

1621954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42704.

The product of its digits is 2160, while the sum is 28.

The square root of 1621954 is about 1273.5595785043. The cubic root of 1621954 is about 117.4932303328.

It can be divided in two parts, 16219 and 54, that multiplied together give a triangular number (875826 = T₁₃₂₃).

The spelling of 1621954 in words is "one million, six hundred twenty-one thousand, nine hundred fifty-four".