1921425849 has 48 divisors (see below), whose sum is σ = 3281833984. Its totient is φ = 1060063200.

The previous prime is 1921425841. The next prime is 1921425859. The reversal of 1921425849 is 9485241291.

It is a happy number.

1921425849 is a `hidden beast` number, since 1 + 9 + 21 + 42 + 584 + 9 = 666.

It is not a de Polignac number, because 1921425849 - 2³ = 1921425841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921425841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1114302 + ... + 1116024.

Almost surely, 2^1921425849 is an apocalyptic number.

It is an amenable number.

1921425849 is a deficient number, since it is larger than the sum of its proper divisors (1360408135).

1921425849 is a wasteful number, since it uses less digits than its factorization.

1921425849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2338 (or 2335 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 1921425849 is about 43834.0717821194. The cubic root of 1921425849 is about 1243.2005959987.

The spelling of 1921425849 in words is "one billion, nine hundred twenty-one million, four hundred twenty-five thousand, eight hundred forty-nine".