9981423 has 24 divisors (see below), whose sum is σ = 15069600. Its totient is φ = 6358464.

The previous prime is 9981383. The next prime is 9981463. The reversal of 9981423 is 3241899.

It is an interprime number because it is at equal distance from previous prime (9981383) and next prime (9981463).

It is not a de Polignac number, because 9981423 - 2⁶ = 9981359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9981463) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43473 + ... + 43701.

It is an arithmetic number, because the mean of its divisors is an integer number (627900).

Almost surely, 2^9981423 is an apocalyptic number.

9981423 is a deficient number, since it is larger than the sum of its proper divisors (5088177).

9981423 is a wasteful number, since it uses less digits than its factorization.

9981423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 428 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 9981423 is about 3159.3390131482. The cubic root of 9981423 is about 215.3099765286.

It can be divided in two parts, 9981 and 423, that added together give a square (10404 = 102²).

The spelling of 9981423 in words is "nine million, nine hundred eighty-one thousand, four hundred twenty-three".