10400387 has 4 divisors (see below), whose sum is σ = 10410816. Its totient is φ = 10389960.

The previous prime is 10400339. The next prime is 10400389. The reversal of 10400387 is 78300401.

It is a happy number.

10400387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78300401 = 1549 ⋅50549.

It is a cyclic number.

It is not a de Polignac number, because 10400387 - 2¹⁶ = 10334851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10400389) 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, 3539 + ... + 5772.

It is an arithmetic number, because the mean of its divisors is an integer number (2602704).

Almost surely, 2^10400387 is an apocalyptic number.

10400387 is a deficient number, since it is larger than the sum of its proper divisors (10429).

10400387 is an equidigital number, since it uses as much as digits as its factorization.

10400387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10428.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 10400387 is about 3224.9631005641. The cubic root of 10400387 is about 218.2812840725.

Adding to 10400387 its reverse (78300401), we get a palindrome (88700788).

The spelling of 10400387 in words is "ten million, four hundred thousand, three hundred eighty-seven".