399925741 has 2 divisors, whose sum is σ = 399925742. Its totient is φ = 399925740.

The previous prime is 399925739. The next prime is 399925759. The reversal of 399925741 is 147529993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245047716 + 154878025 = 15654^2 + 12445^2 .

It is a cyclic number.

It is not a de Polignac number, because 399925741 - 2¹ = 399925739 is a prime.

Together with 399925739, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399905741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199962870 + 199962871.

It is an arithmetic number, because the mean of its divisors is an integer number (199962871).

Almost surely, 2^399925741 is an apocalyptic number.

It is an amenable number.

399925741 is a deficient number, since it is larger than the sum of its proper divisors (1).

399925741 is an equidigital number, since it uses as much as digits as its factorization.

399925741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 49.

The square root of 399925741 is about 19998.1434388295. The cubic root of 399925741 is about 736.7607014904.

The spelling of 399925741 in words is "three hundred ninety-nine million, nine hundred twenty-five thousand, seven hundred forty-one".