1391628172 has 24 divisors (see below), whose sum is σ = 2796575040. Its totient is φ = 599265360.

The previous prime is 1391628163. The next prime is 1391628181. The reversal of 1391628172 is 2718261931.

It is an interprime number because it is at equal distance from previous prime (1391628163) and next prime (1391628181).

It is a super-3 number, since 3×1391628172³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 831478 + ... + 833149.

It is an arithmetic number, because the mean of its divisors is an integer number (116523960).

Almost surely, 2^1391628172 is an apocalyptic number.

It is an amenable number.

1391628172 is an abundant number, since it is smaller than the sum of its proper divisors (1404946868).

1391628172 is a wasteful number, since it uses less digits than its factorization.

1391628172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664661 (or 1664659 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 1391628172 is about 37304.5328613025. The cubic root of 1391628172 is about 1116.4546083199.

The spelling of 1391628172 in words is "one billion, three hundred ninety-one million, six hundred twenty-eight thousand, one hundred seventy-two".