11961639 has 12 divisors (see below), whose sum is σ = 17317872. Its totient is φ = 7956000.

The previous prime is 11961589. The next prime is 11961647. The reversal of 11961639 is 93616911.

11961639 is a `hidden beast` number, since 1 + 1 + 9 + 616 + 39 = 666.

11961639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11961639 - 2¹⁵ = 11928871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11961839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3414 + ... + 5964.

It is an arithmetic number, because the mean of its divisors is an integer number (1443156).

Almost surely, 2^11961639 is an apocalyptic number.

11961639 is a deficient number, since it is larger than the sum of its proper divisors (5356233).

11961639 is a wasteful number, since it uses less digits than its factorization.

11961639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3078 (or 3075 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 11961639 is about 3458.5602495836. The cubic root of 11961639 is about 228.6986304071.

The spelling of 11961639 in words is "eleven million, nine hundred sixty-one thousand, six hundred thirty-nine".