15420523460440 has 64 divisors (see below), whose sum is σ = 41985290779200. Its totient is φ = 4976034459648.

The previous prime is 15420523460431. The next prime is 15420523460449. The reversal of 15420523460440 is 4406432502451.

It is an interprime number because it is at equal distance from previous prime (15420523460431) and next prime (15420523460449).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 15420523460393 and 15420523460402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15420523460449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1619798125 + ... + 1619807644.

It is an arithmetic number, because the mean of its divisors is an integer number (656020168425).

Almost surely, 2^{15420523460440} is an apocalyptic number.

15420523460440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15420523460440 is an abundant number, since it is smaller than the sum of its proper divisors (26564767318760).

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

15420523460440 is a wasteful number, since it uses less digits than its factorization.

15420523460440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3239605804 (or 3239605800 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 40.

Adding to 15420523460440 its reverse (4406432502451), we get a palindrome (19826955962891).

The spelling of 15420523460440 in words is "fifteen trillion, four hundred twenty billion, five hundred twenty-three million, four hundred sixty thousand, four hundred forty".