7988157 has 6 divisors (see below), whose sum is σ = 11538462. Its totient is φ = 5325432.

The previous prime is 7988131. The next prime is 7988177. The reversal of 7988157 is 7518897.

It can be written as a sum of positive squares in only one way, i.e., 7901721 + 86436 = 2811^2 + 294^2 .

It is not a de Polignac number, because 7988157 - 2⁶ = 7988093 is a prime.

7988157 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7988117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 443778 + ... + 443795.

It is an arithmetic number, because the mean of its divisors is an integer number (1923077).

Almost surely, 2^7988157 is an apocalyptic number.

It is an amenable number.

7988157 is a deficient number, since it is larger than the sum of its proper divisors (3550305).

7988157 is a wasteful number, since it uses less digits than its factorization.

7988157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887579 (or 887576 counting only the distinct ones).

The product of its digits is 141120, while the sum is 45.

The square root of 7988157 is about 2826.3327829539. The cubic root of 7988157 is about 199.9012595930.

The spelling of 7988157 in words is "seven million, nine hundred eighty-eight thousand, one hundred fifty-seven".