42140251 has 8 divisors (see below), whose sum is σ = 43513344. Its totient is φ = 40783680.

The previous prime is 42140243. The next prime is 42140257. The reversal of 42140251 is 15204124.

42140251 = T₄₅₈ + T₄₅₉ + ... + T₇₀₃.

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

It is a cyclic number.

It is not a de Polignac number, because 42140251 - 2³ = 42140243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42140257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1161 + ... + 9253.

It is an arithmetic number, because the mean of its divisors is an integer number (5439168).

Almost surely, 2^42140251 is an apocalyptic number.

42140251 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

42140251 is a deficient number, since it is larger than the sum of its proper divisors (1373093).

42140251 is a wasteful number, since it uses less digits than its factorization.

42140251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8261.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 42140251 is about 6491.5522796940. The cubic root of 42140251 is about 347.9891522360.

Adding to 42140251 its reverse (15204124), we get a palindrome (57344375).

The spelling of 42140251 in words is "forty-two million, one hundred forty thousand, two hundred fifty-one".