11999955 has 16 divisors (see below), whose sum is σ = 20945664. Its totient is φ = 5818080.

The previous prime is 11999941. The next prime is 11999987. The reversal of 11999955 is 55999911.

It is a happy number.

It is not a de Polignac number, because 11999955 - 2⁸ = 11999699 is a prime.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36199 + ... + 36528.

It is an arithmetic number, because the mean of its divisors is an integer number (1309104).

Almost surely, 2^11999955 is an apocalyptic number.

11999955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11999955 is a deficient number, since it is larger than the sum of its proper divisors (8945709).

11999955 is a wasteful number, since it uses less digits than its factorization.

11999955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72746.

The product of its digits is 164025, while the sum is 48.

The square root of 11999955 is about 3464.0951199411. The cubic root of 11999955 is about 228.9425623317.

The spelling of 11999955 in words is "eleven million, nine hundred ninety-nine thousand, nine hundred fifty-five".