49400021 has 16 divisors (see below), whose sum is σ = 58181760. Its totient is φ = 41469120.

The previous prime is 49400003. The next prime is 49400041. The reversal of 49400021 is 12000494.

It is not a de Polignac number, because 49400021 - 2¹⁰ = 49398997 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 49399966 and 49400002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49400041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3971 + ... + 10703.

It is an arithmetic number, because the mean of its divisors is an integer number (3636360).

Almost surely, 2^49400021 is an apocalyptic number.

It is an amenable number.

49400021 is a deficient number, since it is larger than the sum of its proper divisors (8781739).

49400021 is a wasteful number, since it uses less digits than its factorization.

49400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6796.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 49400021 is about 7028.5148502369. The cubic root of 49400021 is about 366.9236551939.

The spelling of 49400021 in words is "forty-nine million, four hundred thousand, twenty-one".