621742 has 16 divisors (see below), whose sum is σ = 1036800. Its totient is φ = 277240.

The previous prime is 621739. The next prime is 621749. The reversal of 621742 is 247126.

It is a super-2 number, since 2×621742² = 773126229128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621749) 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, 1059 + ... + 1537.

It is an arithmetic number, because the mean of its divisors is an integer number (64800).

2⁶²¹⁷⁴² is an apocalyptic number.

621742 is a deficient number, since it is larger than the sum of its proper divisors (415058).

621742 is a wasteful number, since it uses less digits than its factorization.

621742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551.

The product of its digits is 672, while the sum is 22.

The square root of 621742 is about 788.5061826010. The cubic root of 621742 is about 85.3499757308.

Adding to 621742 its reverse (247126), we get a palindrome (868868).

The spelling of 621742 in words is "six hundred twenty-one thousand, seven hundred forty-two".