401191857 has 48 divisors (see below), whose sum is σ = 674998272. Its totient is φ = 226920960.

The previous prime is 401191807. The next prime is 401191873. The reversal of 401191857 is 758191104.

It is not a de Polignac number, because 401191857 - 2¹⁵ = 401159089 is a prime.

It is a super-2 number, since 2×401191857² = 321909812246216898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401191807) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 212803 + ... + 214679.

It is an arithmetic number, because the mean of its divisors is an integer number (14062464).

Almost surely, 2^401191857 is an apocalyptic number.

It is an amenable number.

401191857 is a deficient number, since it is larger than the sum of its proper divisors (273806415).

401191857 is a wasteful number, since it uses less digits than its factorization.

401191857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2038 (or 2035 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The square root of 401191857 is about 20029.7742623326. The cubic root of 401191857 is about 737.5373805433.

The spelling of 401191857 in words is "four hundred one million, one hundred ninety-one thousand, eight hundred fifty-seven".