1985072157 has 8 divisors (see below), whose sum is σ = 2940847680. Its totient is φ = 1323381420.

The previous prime is 1985072107. The next prime is 1985072183. The reversal of 1985072157 is 7512705891.

1985072157 is a `hidden beast` number, since 1 + 98 + 507 + 2 + 1 + 57 = 666.

It is not a de Polignac number, because 1985072157 - 2¹⁸ = 1984810013 is a prime.

It is a super-2 number, since 2×1985072157² = 7881022936993265298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985072107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36760569 + ... + 36760622.

It is an arithmetic number, because the mean of its divisors is an integer number (367605960).

Almost surely, 2^1985072157 is an apocalyptic number.

It is an amenable number.

1985072157 is a deficient number, since it is larger than the sum of its proper divisors (955775523).

1985072157 is an equidigital number, since it uses as much as digits as its factorization.

1985072157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73521200 (or 73521194 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 45.

The square root of 1985072157 is about 44554.1485947156. The cubic root of 1985072157 is about 1256.7785678610.

The spelling of 1985072157 in words is "one billion, nine hundred eighty-five million, seventy-two thousand, one hundred fifty-seven".