1849695021 has 20 divisors (see below), whose sum is σ = 2764928892. Its totient is φ = 1232324928.

The previous prime is 1849695007. The next prime is 1849695031. The reversal of 1849695021 is 1205969481.

1849695021 is a `hidden beast` number, since 1 + 84 + 9 + 69 + 502 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1009332900 + 840362121 = 31770^2 + 28989^2 .

It is not a de Polignac number, because 1849695021 - 2⁵ = 1849694989 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1849695031) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 133785 + ... + 146961.

Almost surely, 2^1849695021 is an apocalyptic number.

It is an amenable number.

1849695021 is a deficient number, since it is larger than the sum of its proper divisors (915233871).

1849695021 is a wasteful number, since it uses less digits than its factorization.

1849695021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14922 (or 14913 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1849695021 is about 43008.0808802253. The cubic root of 1849695021 is about 1227.5335643708.

The spelling of 1849695021 in words is "one billion, eight hundred forty-nine million, six hundred ninety-five thousand, twenty-one".