2158401 has 12 divisors (see below), whose sum is σ = 3347952. Its totient is φ = 1233288.

The previous prime is 2158393. The next prime is 2158423. The reversal of 2158401 is 1048512.

It is not a de Polignac number, because 2158401 - 2³ = 2158393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2158301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7195 + ... + 7488.

It is an arithmetic number, because the mean of its divisors is an integer number (278996).

2^2158401 is an apocalyptic number.

2158401 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2158401 is a deficient number, since it is larger than the sum of its proper divisors (1189551).

2158401 is a wasteful number, since it uses less digits than its factorization.

2158401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14700 (or 14693 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 2158401 is about 1469.1497541095. The cubic root of 2158401 is about 129.2341759252.

The spelling of 2158401 in words is "two million, one hundred fifty-eight thousand, four hundred one".