15430423440 has 40 divisors (see below), whose sum is σ = 47834313408. Its totient is φ = 4114779520.

The previous prime is 15430423433. The next prime is 15430423441. The reversal of 15430423440 is 4432403451.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 15430423398 and 15430423407.

It is not an unprimeable number, because it can be changed into a prime (15430423441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32146476 + ... + 32146955.

Almost surely, 2^15430423440 is an apocalyptic number.

15430423440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15430423440 is an abundant number, since it is smaller than the sum of its proper divisors (32403889968).

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

15430423440 is a wasteful number, since it uses less digits than its factorization.

15430423440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64293447 (or 64293441 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 15430423440 its reverse (4432403451), we get a palindrome (19862826891).

The spelling of 15430423440 in words is "fifteen billion, four hundred thirty million, four hundred twenty-three thousand, four hundred forty".