42389251 has 4 divisors (see below), whose sum is σ = 42430192. Its totient is φ = 42348312.

The previous prime is 42389239. The next prime is 42389261. The reversal of 42389251 is 15298324.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42389251 - 2⁵ = 42389219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42389231) 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, 18876 + ... + 21001.

It is an arithmetic number, because the mean of its divisors is an integer number (10607548).

Almost surely, 2^42389251 is an apocalyptic number.

42389251 is a deficient number, since it is larger than the sum of its proper divisors (40941).

42389251 is a wasteful number, since it uses less digits than its factorization.

42389251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40940.

The product of its digits is 17280, while the sum is 34.

The square root of 42389251 is about 6510.7028038454. The cubic root of 42389251 is about 348.6732107413.

The spelling of 42389251 in words is "forty-two million, three hundred eighty-nine thousand, two hundred fifty-one".