40248821 has 4 divisors (see below), whose sum is σ = 42367200. Its totient is φ = 38130444.

The previous prime is 40248787. The next prime is 40248823. The reversal of 40248821 is 12884204.

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 40248821 - 2²² = 36054517 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 (40248823) 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, 1059161 + ... + 1059198.

It is an arithmetic number, because the mean of its divisors is an integer number (10591800).

Almost surely, 2^40248821 is an apocalyptic number.

It is an amenable number.

40248821 is a deficient number, since it is larger than the sum of its proper divisors (2118379).

40248821 is a wasteful number, since it uses less digits than its factorization.

40248821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118378.

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 40248821 is about 6344.1958513274. The cubic root of 40248821 is about 342.7028538841.

The spelling of 40248821 in words is "forty million, two hundred forty-eight thousand, eight hundred twenty-one".