10399780 has 12 divisors (see below), whose sum is σ = 21839580. Its totient is φ = 4159904.

The previous prime is 10399757. The next prime is 10399789. The reversal of 10399780 is 8799301.

It can be written as a sum of positive squares in 2 ways, for example, as 4169764 + 6230016 = 2042^2 + 2496^2 .

It is not an unprimeable number, because it can be changed into a prime (10399789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259975 + ... + 260014.

It is an arithmetic number, because the mean of its divisors is an integer number (1819965).

Almost surely, 2^10399780 is an apocalyptic number.

10399780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10399780 is an abundant number, since it is smaller than the sum of its proper divisors (11439800).

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

10399780 is a wasteful number, since it uses less digits than its factorization.

10399780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519998 (or 519996 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 10399780 is about 3224.8689895870. The cubic root of 10399780 is about 218.2770374576.

The spelling of 10399780 in words is "ten million, three hundred ninety-nine thousand, seven hundred eighty".