42640401 has 8 divisors (see below), whose sum is σ = 57019104. Its totient is φ = 28344320.

The previous prime is 42640393. The next prime is 42640417. The reversal of 42640401 is 10404624.

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 42640401 - 2³ = 42640393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42640441) 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, 19440 + ... + 21521.

It is an arithmetic number, because the mean of its divisors is an integer number (7127388).

Almost surely, 2^42640401 is an apocalyptic number.

It is an amenable number.

42640401 is a deficient number, since it is larger than the sum of its proper divisors (14378703).

42640401 is a wasteful number, since it uses less digits than its factorization.

42640401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41311.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 42640401 is about 6529.9617916187. The cubic root of 42640401 is about 349.3604675093.

The spelling of 42640401 in words is "forty-two million, six hundred forty thousand, four hundred one".