401243420 has 24 divisors (see below), whose sum is σ = 871668000. Its totient is φ = 154962752.

The previous prime is 401243411. The next prime is 401243431. The reversal of 401243420 is 24342104.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 401243392 and 401243401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345320 + ... + 346479.

It is an arithmetic number, because the mean of its divisors is an integer number (36319500).

Almost surely, 2^401243420 is an apocalyptic number.

It is an amenable number.

401243420 is an abundant number, since it is smaller than the sum of its proper divisors (470424580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401243420 is a wasteful number, since it uses less digits than its factorization.

401243420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691837 (or 691835 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 401243420 is about 20031.0613797672. The cubic root of 401243420 is about 737.5689764080.

Adding to 401243420 its reverse (24342104), we get a palindrome (425585524).

The spelling of 401243420 in words is "four hundred one million, two hundred forty-three thousand, four hundred twenty".