40991123 has 4 divisors (see below), whose sum is σ = 42404640. Its totient is φ = 39577608.

The previous prime is 40991107. The next prime is 40991141. The reversal of 40991123 is 32119904.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40991123 - 2⁴ = 40991107 is a prime.

It is a super-2 number, since 2×40991123² = 3360544329602258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 1413487 = 40991123 / (4 + 0 + 9 + 9 + 1 + 1 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40991143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 706715 + ... + 706772.

It is an arithmetic number, because the mean of its divisors is an integer number (10601160).

Almost surely, 2^40991123 is an apocalyptic number.

40991123 is a deficient number, since it is larger than the sum of its proper divisors (1413517).

40991123 is a wasteful number, since it uses less digits than its factorization.

40991123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413516.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 40991123 is about 6402.4310226663. The cubic root of 40991123 is about 344.7968362059.

It can be divided in two parts, 40991 and 123, that added together give a palindrome (41114).

The spelling of 40991123 in words is "forty million, nine hundred ninety-one thousand, one hundred twenty-three".