11981770 has 16 divisors (see below), whose sum is σ = 22836168. Its totient is φ = 4510720.

The previous prime is 11981743. The next prime is 11981773. The reversal of 11981770 is 7718911.

It can be written as a sum of positive squares in 4 ways, for example, as 11978521 + 3249 = 3461^2 + 57^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (11981773) 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, 35071 + ... + 35410.

Almost surely, 2^11981770 is an apocalyptic number.

11981770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11981770 is a deficient number, since it is larger than the sum of its proper divisors (10854398).

11981770 is a wasteful number, since it uses less digits than its factorization.

11981770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70505.

The product of its (nonzero) digits is 3528, while the sum is 34.

The square root of 11981770 is about 3461.4693411902. The cubic root of 11981770 is about 228.8268556386.

The spelling of 11981770 in words is "eleven million, nine hundred eighty-one thousand, seven hundred seventy".