1423400438 has 4 divisors (see below), whose sum is σ = 2135100660. Its totient is φ = 711700218.

The previous prime is 1423400431. The next prime is 1423400479. The reversal of 1423400438 is 8340043241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8340043241 = 233 ⋅35794177.

It is a self number, because there is not a number n which added to its sum of digits gives 1423400438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423400431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 355850108 + ... + 355850111.

It is an arithmetic number, because the mean of its divisors is an integer number (533775165).

Almost surely, 2^1423400438 is an apocalyptic number.

1423400438 is a deficient number, since it is larger than the sum of its proper divisors (711700222).

1423400438 is an equidigital number, since it uses as much as digits as its factorization.

1423400438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711700221.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 1423400438 is about 37727.9795112328. The cubic root of 1423400438 is about 1124.8873468761.

Adding to 1423400438 its reverse (8340043241), we get a palindrome (9763443679).

The spelling of 1423400438 in words is "one billion, four hundred twenty-three million, four hundred thousand, four hundred thirty-eight".