621938 has 4 divisors (see below), whose sum is σ = 932910. Its totient is φ = 310968.

The previous prime is 621937. The next prime is 621941. The reversal of 621938 is 839126.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 839126 = 2 ⋅419563.

It can be written as a sum of positive squares in only one way, i.e., 508369 + 113569 = 713^2 + 337^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 621938.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621938.

It is not an unprimeable number, because it can be changed into a prime (621937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155483 + ... + 155486.

2⁶²¹⁹³⁸ is an apocalyptic number.

621938 is a deficient number, since it is larger than the sum of its proper divisors (310972).

621938 is a wasteful number, since it uses less digits than its factorization.

621938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310971.

The product of its digits is 2592, while the sum is 29.

The square root of 621938 is about 788.6304584531. The cubic root of 621938 is about 85.3589434579.

The spelling of 621938 in words is "six hundred twenty-one thousand, nine hundred thirty-eight".