3936405561 has 16 divisors (see below), whose sum is σ = 5763606528. Its totient is φ = 2369898000.

The previous prime is 3936405547. The next prime is 3936405569. The reversal of 3936405561 is 1655046393.

It is not a de Polignac number, because 3936405561 - 2⁷ = 3936405433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3936405569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390001 + ... + 399966.

It is an arithmetic number, because the mean of its divisors is an integer number (360225408).

Almost surely, 2^3936405561 is an apocalyptic number.

It is an amenable number.

3936405561 is a deficient number, since it is larger than the sum of its proper divisors (1827200967).

3936405561 is a wasteful number, since it uses less digits than its factorization.

3936405561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790132.

The product of its (nonzero) digits is 291600, while the sum is 42.

The square root of 3936405561 is about 62740.7806852927. The cubic root of 3936405561 is about 1578.9435817238.

The spelling of 3936405561 in words is "three billion, nine hundred thirty-six million, four hundred five thousand, five hundred sixty-one".