172157386 has 16 divisors (see below), whose sum is σ = 260523648. Its totient is φ = 85320000.

The previous prime is 172157383. The next prime is 172157389. The reversal of 172157386 is 683751271.

It is an interprime number because it is at equal distance from previous prime (172157383) and next prime (172157389).

It is not an unprimeable number, because it can be changed into a prime (172157383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120271 + ... + 121693.

It is an arithmetic number, because the mean of its divisors is an integer number (16282728).

Almost surely, 2^172157386 is an apocalyptic number.

172157386 is a deficient number, since it is larger than the sum of its proper divisors (88366262).

172157386 is a wasteful number, since it uses less digits than its factorization.

172157386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917.

The product of its digits is 70560, while the sum is 40.

The square root of 172157386 is about 13120.8759616117. The cubic root of 172157386 is about 556.2993509890.

The spelling of 172157386 in words is "one hundred seventy-two million, one hundred fifty-seven thousand, three hundred eighty-six".