15400220 has 24 divisors (see below), whose sum is σ = 35281008. Its totient is φ = 5600000.

The previous prime is 15400219. The next prime is 15400223. The reversal of 15400220 is 2200451.

It is a junction number, because it is equal to n+sod(n) for n = 15400195 and 15400204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15400223) 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, 34781 + ... + 35220.

It is an arithmetic number, because the mean of its divisors is an integer number (1470042).

Almost surely, 2^15400220 is an apocalyptic number.

15400220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15400220 is an abundant number, since it is smaller than the sum of its proper divisors (19880788).

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

15400220 is a wasteful number, since it uses less digits than its factorization.

15400220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70021 (or 70019 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 15400220 is about 3924.3114045651. The cubic root of 15400220 is about 248.7953782015.

Adding to 15400220 its reverse (2200451), we get a palindrome (17600671).

The spelling of 15400220 in words is "fifteen million, four hundred thousand, two hundred twenty".