40919813 has 4 divisors (see below), whose sum is σ = 44639808. Its totient is φ = 37199820.

The previous prime is 40919803. The next prime is 40919839. The reversal of 40919813 is 31891904.

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 40919813 - 2¹⁰ = 40918789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40919803) 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, 1859981 + ... + 1860002.

It is an arithmetic number, because the mean of its divisors is an integer number (11159952).

Almost surely, 2^40919813 is an apocalyptic number.

It is an amenable number.

40919813 is a deficient number, since it is larger than the sum of its proper divisors (3719995).

40919813 is a wasteful number, since it uses less digits than its factorization.

40919813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3719994.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 40919813 is about 6396.8596201574. The cubic root of 40919813 is about 344.5967787934.

The spelling of 40919813 in words is "forty million, nine hundred nineteen thousand, eight hundred thirteen".