40991401 has 4 divisors (see below), whose sum is σ = 44717904. Its totient is φ = 37264900.

The previous prime is 40991387. The next prime is 40991407. The reversal of 40991401 is 10419904.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40991401 - 2⁷ = 40991273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40991401.

It is not an unprimeable number, because it can be changed into a prime (40991407) 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, 1863235 + ... + 1863256.

It is an arithmetic number, because the mean of its divisors is an integer number (11179476).

Almost surely, 2^40991401 is an apocalyptic number.

It is an amenable number.

40991401 is a deficient number, since it is larger than the sum of its proper divisors (3726503).

40991401 is a wasteful number, since it uses less digits than its factorization.

40991401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3726502.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 40991401 is about 6402.4527331328. The cubic root of 40991401 is about 344.7976156698.

The spelling of 40991401 in words is "forty million, nine hundred ninety-one thousand, four hundred one".