11991290 has 16 divisors (see below), whose sum is σ = 22854312. Its totient is φ = 4514304.

The previous prime is 11991271. The next prime is 11991313. The reversal of 11991290 is 9219911.

It can be written as a sum of positive squares in 4 ways, for example, as 11978521 + 12769 = 3461^2 + 113^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35099 + ... + 35438.

Almost surely, 2^11991290 is an apocalyptic number.

11991290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11991290 is a deficient number, since it is larger than the sum of its proper divisors (10863022).

11991290 is a wasteful number, since it uses less digits than its factorization.

11991290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70561.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 11991290 is about 3462.8442067179. The cubic root of 11991290 is about 228.8874436533.

The spelling of 11991290 in words is "eleven million, nine hundred ninety-one thousand, two hundred ninety".