15400353920 has 128 divisors (see below), whose sum is σ = 42360192000. Its totient is φ = 5244456960.

The previous prime is 15400353911. The next prime is 15400353967. The reversal of 15400353920 is 2935300451.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×15400353920² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 655985 + ... + 679055.

It is an arithmetic number, because the mean of its divisors is an integer number (330939000).

Almost surely, 2^15400353920 is an apocalyptic number.

15400353920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15400353920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21180096000).

15400353920 is an abundant number, since it is smaller than the sum of its proper divisors (26959838080).

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

15400353920 is a wasteful number, since it uses less digits than its factorization.

15400353920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23246 (or 23234 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 32.

The spelling of 15400353920 in words is "fifteen billion, four hundred million, three hundred fifty-three thousand, nine hundred twenty".