251942 has 8 divisors (see below), whose sum is σ = 394416. Its totient is φ = 120472.

The previous prime is 251941. The next prime is 251947. The reversal of 251942 is 249152.

251942 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an Ulam number.

It is a nialpdrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2693 + ... + 2784.

It is an arithmetic number, because the mean of its divisors is an integer number (49302).

2²⁵¹⁹⁴² is an apocalyptic number.

251942 is a deficient number, since it is larger than the sum of its proper divisors (142474).

251942 is a wasteful number, since it uses less digits than its factorization.

251942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5502.

The product of its digits is 720, while the sum is 23.

The square root of 251942 is about 501.9382432132. The cubic root of 251942 is about 63.1587497204.

The spelling of 251942 in words is "two hundred fifty-one thousand, nine hundred forty-two".