46640821 has 8 divisors (see below), whose sum is σ = 47878488. Its totient is φ = 45408000.

The previous prime is 46640819. The next prime is 46640837. The reversal of 46640821 is 12804664.

It can be written as a sum of positive squares in 4 ways, for example, as 6812100 + 39828721 = 2610^2 + 6311^2 .

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 46640821 - 2¹ = 46640819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (46640861) 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, 26241 + ... + 27961.

It is an arithmetic number, because the mean of its divisors is an integer number (5984811).

Almost surely, 2^46640821 is an apocalyptic number.

46640821 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

46640821 is a deficient number, since it is larger than the sum of its proper divisors (1237667).

46640821 is a wasteful number, since it uses less digits than its factorization.

46640821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2423.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 46640821 is about 6829.4085395443. The cubic root of 46640821 is about 359.9609551276.

The spelling of 46640821 in words is "forty-six million, six hundred forty thousand, eight hundred twenty-one".