1621398 has 16 divisors (see below), whose sum is σ = 3262896. Its totient is φ = 537120.

The previous prime is 1621397. The next prime is 1621421. The reversal of 1621398 is 8931261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621391) 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, 340 + ... + 1832.

It is an arithmetic number, because the mean of its divisors is an integer number (203931).

2^1621398 is an apocalyptic number.

1621398 is an abundant number, since it is smaller than the sum of its proper divisors (1641498).

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

1621398 is a wasteful number, since it uses less digits than its factorization.

1621398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679.

The product of its digits is 2592, while the sum is 30.

The square root of 1621398 is about 1273.3412739718. The cubic root of 1621398 is about 117.4798033794.

The spelling of 1621398 in words is "one million, six hundred twenty-one thousand, three hundred ninety-eight".