1423420381 has 4 divisors (see below), whose sum is σ = 1431284764. Its totient is φ = 1415556000.

The previous prime is 1423420379. The next prime is 1423420391. The reversal of 1423420381 is 1830243241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1830243241 = 439 ⋅4169119.

It can be written as a sum of positive squares in 2 ways, for example, as 253096281 + 1170324100 = 15909^2 + 34210^2 .

It is a cyclic number.

It is not a de Polignac number, because 1423420381 - 2¹ = 1423420379 is a prime.

It is a super-2 number, since 2×1423420381² = 4052251162092370322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423420301) 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, 3931920 + ... + 3932281.

It is an arithmetic number, because the mean of its divisors is an integer number (357821191).

Almost surely, 2^1423420381 is an apocalyptic number.

It is an amenable number.

1423420381 is a deficient number, since it is larger than the sum of its proper divisors (7864383).

1423420381 is an equidigital number, since it uses as much as digits as its factorization.

1423420381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7864382.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 1423420381 is about 37728.2438101749. The cubic root of 1423420381 is about 1124.8926003810.

The spelling of 1423420381 in words is "one billion, four hundred twenty-three million, four hundred twenty thousand, three hundred eighty-one".