15400503640 has 64 divisors (see below), whose sum is σ = 36641445120. Its totient is φ = 5816064000.

The previous prime is 15400503623. The next prime is 15400503641. The reversal of 15400503640 is 4630500451.

It is a junction number, because it is equal to n+sod(n) for n = 15400503599 and 15400503608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15400503641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100621 + ... + 202300.

It is an arithmetic number, because the mean of its divisors is an integer number (572522580).

Almost surely, 2^15400503640 is an apocalyptic number.

15400503640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15400503640 is an abundant number, since it is smaller than the sum of its proper divisors (21240941480).

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

15400503640 is a wasteful number, since it uses less digits than its factorization.

15400503640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303004 (or 303000 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 15400503640 in words is "fifteen billion, four hundred million, five hundred three thousand, six hundred forty".