11951990 has 16 divisors (see below), whose sum is σ = 21626352. Its totient is φ = 4755744.

The previous prime is 11951987. The next prime is 11951993. The reversal of 11951990 is 9915911.

It is an interprime number because it is at equal distance from previous prime (11951987) and next prime (11951993).

It is a self number, because there is not a number n which added to its sum of digits gives 11951990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11951993) 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, 1064 + ... + 5003.

It is an arithmetic number, because the mean of its divisors is an integer number (1351647).

Almost surely, 2^11951990 is an apocalyptic number.

11951990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11951990 is a deficient number, since it is larger than the sum of its proper divisors (9674362).

11951990 is a wasteful number, since it uses less digits than its factorization.

11951990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6271.

The product of its (nonzero) digits is 3645, while the sum is 35.

The square root of 11951990 is about 3457.1650235417. The cubic root of 11951990 is about 228.6371196975.

The spelling of 11951990 in words is "eleven million, nine hundred fifty-one thousand, nine hundred ninety".