421240857 has 8 divisors (see below), whose sum is σ = 574716384. Its totient is φ = 274296288.

The previous prime is 421240843. The next prime is 421240889. The reversal of 421240857 is 758042124.

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

It is not a de Polignac number, because 421240857 - 2¹¹ = 421238809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421240817) 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, 1632588 + ... + 1632845.

It is an arithmetic number, because the mean of its divisors is an integer number (71839548).

Almost surely, 2^421240857 is an apocalyptic number.

It is an amenable number.

421240857 is a deficient number, since it is larger than the sum of its proper divisors (153475527).

421240857 is a wasteful number, since it uses less digits than its factorization.

421240857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3265479.

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 421240857 is about 20524.1530154109. The cubic root of 421240857 is about 749.6240231089.

The spelling of 421240857 in words is "four hundred twenty-one million, two hundred forty thousand, eight hundred fifty-seven".