15780130 has 16 divisors (see below), whose sum is σ = 29172600. Its totient is φ = 6141312.

The previous prime is 15780113. The next prime is 15780133. The reversal of 15780130 is 3108751.

It can be written as a sum of positive squares in 4 ways, for example, as 15280281 + 499849 = 3909^2 + 707^2 .

It is a junction number, because it is equal to n+sod(n) for n = 15780095 and 15780104.

It is not an unprimeable number, because it can be changed into a prime (15780133) 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, 20955 + ... + 21694.

Almost surely, 2^15780130 is an apocalyptic number.

15780130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15780130 is a deficient number, since it is larger than the sum of its proper divisors (13392470).

15780130 is a wasteful number, since it uses less digits than its factorization.

15780130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42693.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 15780130 is about 3972.4211760588. The cubic root of 15780130 is about 250.8246369051.

Adding to 15780130 its reverse (3108751), we get a palindrome (18888881).

The spelling of 15780130 in words is "fifteen million, seven hundred eighty thousand, one hundred thirty".