641949 has 24 divisors (see below), whose sum is σ = 1088928. Its totient is φ = 332640.

The previous prime is 641929. The next prime is 641959. The reversal of 641949 is 949146.

It is not a de Polignac number, because 641949 - 2⁷ = 641821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1419 + ... + 1815.

It is an arithmetic number, because the mean of its divisors is an integer number (45372).

2⁶⁴¹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

641949 is a deficient number, since it is larger than the sum of its proper divisors (446979).

641949 is a wasteful number, since it uses less digits than its factorization.

641949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425 (or 418 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 641949 is about 801.2171990166. The cubic root of 641949 is about 86.2647779761.

The spelling of 641949 in words is "six hundred forty-one thousand, nine hundred forty-nine".