1420440401 has 4 divisors (see below), whose sum is σ = 1441641072. Its totient is φ = 1399239732.

The previous prime is 1420440391. The next prime is 1420440407. The reversal of 1420440401 is 1040440241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1420440401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1420440407) 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, 10600235 + ... + 10600368.

It is an arithmetic number, because the mean of its divisors is an integer number (360410268).

Almost surely, 2^1420440401 is an apocalyptic number.

It is an amenable number.

1420440401 is a deficient number, since it is larger than the sum of its proper divisors (21200671).

1420440401 is an equidigital number, since it uses as much as digits as its factorization.

1420440401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21200670.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1420440401 is about 37688.7304243590. The cubic root of 1420440401 is about 1124.1070513597.

Adding to 1420440401 its reverse (1040440241), we get a palindrome (2460880642).

The spelling of 1420440401 in words is "one billion, four hundred twenty million, four hundred forty thousand, four hundred one".