1993622257 has 12 divisors (see below), whose sum is σ = 2202716740. Its totient is φ = 1802972160.

The previous prime is 1993622237. The next prime is 1993622297. The reversal of 1993622257 is 7522263991.

It can be written as a sum of positive squares in 2 ways, for example, as 161696656 + 1831925601 = 12716^2 + 42801^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1993622257 is a prime.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1993622237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19332 + ... + 66037.

Almost surely, 2^1993622257 is an apocalyptic number.

It is an amenable number.

1993622257 is a deficient number, since it is larger than the sum of its proper divisors (209094483).

1993622257 is a wasteful number, since it uses less digits than its factorization.

1993622257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85584 (or 85573 counting only the distinct ones).

The product of its digits is 408240, while the sum is 46.

The square root of 1993622257 is about 44649.9972788353. The cubic root of 1993622257 is about 1258.5803817011.

The spelling of 1993622257 in words is "one billion, nine hundred ninety-three million, six hundred twenty-two thousand, two hundred fifty-seven".