399061787 has 2 divisors, whose sum is σ = 399061788. Its totient is φ = 399061786.

The previous prime is 399061739. The next prime is 399061829. The reversal of 399061787 is 787160993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399061787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (399061717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199530893 + 199530894.

It is an arithmetic number, because the mean of its divisors is an integer number (199530894).

Almost surely, 2^399061787 is an apocalyptic number.

399061787 is a deficient number, since it is larger than the sum of its proper divisors (1).

399061787 is an equidigital number, since it uses as much as digits as its factorization.

399061787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 399061787 is about 19976.5309050395. The cubic root of 399061787 is about 736.2297810377.

The spelling of 399061787 in words is "three hundred ninety-nine million, sixty-one thousand, seven hundred eighty-seven".