49890921 has 4 divisors (see below), whose sum is σ = 66521232. Its totient is φ = 33260612.

The previous prime is 49890917. The next prime is 49890943. The reversal of 49890921 is 12909894.

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 49890921 - 2² = 49890917 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (49890961) 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, 8315151 + ... + 8315156.

It is an arithmetic number, because the mean of its divisors is an integer number (16630308).

Almost surely, 2^49890921 is an apocalyptic number.

It is an amenable number.

49890921 is a deficient number, since it is larger than the sum of its proper divisors (16630311).

49890921 is a wasteful number, since it uses less digits than its factorization.

49890921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16630310.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 49890921 is about 7063.3505505532. The cubic root of 49890921 is about 368.1350544977.

It can be divided in two parts, 498 and 90921, that added together give a palindrome (91419).

The spelling of 49890921 in words is "forty-nine million, eight hundred ninety thousand, nine hundred twenty-one".