40251621 has 8 divisors (see below), whose sum is σ = 53720064. Its totient is φ = 26808800.

The previous prime is 40251619. The next prime is 40251637. The reversal of 40251621 is 12615204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40251621 - 2¹ = 40251619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40251611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2376 + ... + 9281.

It is an arithmetic number, because the mean of its divisors is an integer number (6715008).

Almost surely, 2^40251621 is an apocalyptic number.

It is an amenable number.

40251621 is a deficient number, since it is larger than the sum of its proper divisors (13468443).

40251621 is a wasteful number, since it uses less digits than its factorization.

40251621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12811.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 40251621 is about 6344.4165216354. The cubic root of 40251621 is about 342.7108006655.

Adding to 40251621 its reverse (12615204), we get a palindrome (52866825).

The spelling of 40251621 in words is "forty million, two hundred fifty-one thousand, six hundred twenty-one".