42409851 has 8 divisors (see below), whose sum is σ = 61687104. Its totient is φ = 25702920.

The previous prime is 42409847. The next prime is 42409853. The reversal of 42409851 is 15890424.

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

It is not a de Polignac number, because 42409851 - 2² = 42409847 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1285147 = 42409851 / (4 + 2 + 4 + 0 + 9 + 8 + 5 + 1).

It is not an unprimeable number, because it can be changed into a prime (42409853) 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, 642541 + ... + 642606.

It is an arithmetic number, because the mean of its divisors is an integer number (7710888).

Almost surely, 2^42409851 is an apocalyptic number.

42409851 is a deficient number, since it is larger than the sum of its proper divisors (19277253).

42409851 is a wasteful number, since it uses less digits than its factorization.

42409851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285161.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 42409851 is about 6512.2846221583. The cubic root of 42409851 is about 348.7296834300.

The spelling of 42409851 in words is "forty-two million, four hundred nine thousand, eight hundred fifty-one".