3561940 has 24 divisors (see below), whose sum is σ = 7517160. Its totient is φ = 1417728.

The previous prime is 3561913. The next prime is 3561947. The reversal of 3561940 is 491653.

It can be written as a sum of positive squares in 4 ways, for example, as 161604 + 3400336 = 402^2 + 1844^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3561899 and 3561908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3561947) 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, 5976 + ... + 6544.

It is an arithmetic number, because the mean of its divisors is an integer number (313215).

Almost surely, 2^3561940 is an apocalyptic number.

It is an amenable number.

3561940 is an abundant number, since it is smaller than the sum of its proper divisors (3955220).

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

3561940 is a wasteful number, since it uses less digits than its factorization.

With its successor (3561941) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (891).

3561940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891 (or 889 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 3561940 is about 1887.3102553634. The cubic root of 3561940 is about 152.7198656048.

The spelling of 3561940 in words is "three million, five hundred sixty-one thousand, nine hundred forty".