40348821 has 4 divisors (see below), whose sum is σ = 53798432. Its totient is φ = 26899212.

The previous prime is 40348817. The next prime is 40348823. The reversal of 40348821 is 12884304.

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 not a de Polignac number, because 40348821 - 2² = 40348817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40348823) 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, 6724801 + ... + 6724806.

It is an arithmetic number, because the mean of its divisors is an integer number (13449608).

Almost surely, 2^40348821 is an apocalyptic number.

It is an amenable number.

40348821 is a deficient number, since it is larger than the sum of its proper divisors (13449611).

40348821 is a wasteful number, since it uses less digits than its factorization.

40348821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13449610.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 40348821 is about 6352.0721815798. The cubic root of 40348821 is about 342.9864393543.

The spelling of 40348821 in words is "forty million, three hundred forty-eight thousand, eight hundred twenty-one".