15450000 has 120 divisors (see below), whose sum is σ = 50371776. Its totient is φ = 4080000.

The previous prime is 15449947. The next prime is 15450013. The reversal of 15450000 is 5451.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149949 + ... + 150051.

Almost surely, 2^15450000 is an apocalyptic number.

15450000 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 15450000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25185888).

15450000 is an abundant number, since it is smaller than the sum of its proper divisors (34921776).

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

15450000 is an equidigital number, since it uses as much as digits as its factorization.

15450000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 15450000 is about 3930.6488014067. The cubic root of 15450000 is about 249.0631603780.

Adding to 15450000 its reverse (5451), we get a palindrome (15455451).

The spelling of 15450000 in words is "fifteen million, four hundred fifty thousand".