13850991 has 72 divisors (see below), whose sum is σ = 26557440. Its totient is φ = 6795360.

The previous prime is 13850983. The next prime is 13850999. The reversal of 13850991 is 19905831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13850983) and next prime (13850999).

It is not a de Polignac number, because 13850991 - 2³ = 13850983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13850999) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 175290 + ... + 175368.

Almost surely, 2^13850991 is an apocalyptic number.

13850991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13850991 is a deficient number, since it is larger than the sum of its proper divisors (12706449).

13850991 is a wasteful number, since it uses less digits than its factorization.

13850991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 13850991 is about 3721.6919539371. The cubic root of 13850991 is about 240.1560963693.

It can be divided in two parts, 13850 and 991, that added together give a palindrome (14841).

The spelling of 13850991 in words is "thirteen million, eight hundred fifty thousand, nine hundred ninety-one".