401209847 has 4 divisors (see below), whose sum is σ = 402658536. Its totient is φ = 399761160.

The previous prime is 401209829. The next prime is 401209859. The reversal of 401209847 is 748902104.

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 401209847 - 2⁸ = 401209591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401209807) 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, 723929 + ... + 724482.

It is an arithmetic number, because the mean of its divisors is an integer number (100664634).

Almost surely, 2^401209847 is an apocalyptic number.

401209847 is a deficient number, since it is larger than the sum of its proper divisors (1448689).

401209847 is a wasteful number, since it uses less digits than its factorization.

401209847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448688.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 401209847 is about 20030.2233387449. The cubic root of 401209847 is about 737.5484044453.

The spelling of 401209847 in words is "four hundred one million, two hundred nine thousand, eight hundred forty-seven".