49690821 has 4 divisors (see below), whose sum is σ = 66254432. Its totient is φ = 33127212.

The previous prime is 49690819. The next prime is 49690873. The reversal of 49690821 is 12809694.

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 49690821 - 2¹ = 49690819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 49690821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49690801) 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, 8281801 + ... + 8281806.

It is an arithmetic number, because the mean of its divisors is an integer number (16563608).

Almost surely, 2^49690821 is an apocalyptic number.

It is an amenable number.

49690821 is a deficient number, since it is larger than the sum of its proper divisors (16563611).

49690821 is a wasteful number, since it uses less digits than its factorization.

49690821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16563610.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 49690821 is about 7049.1716534640. The cubic root of 49690821 is about 367.6422291810.

The spelling of 49690821 in words is "forty-nine million, six hundred ninety thousand, eight hundred twenty-one".