396851887 has 4 divisors (see below), whose sum is σ = 400492840. Its totient is φ = 393210936.

The previous prime is 396851869. The next prime is 396851933. The reversal of 396851887 is 788158693.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 396851887 - 2¹⁹ = 396327599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396851827) 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, 1820313 + ... + 1820530.

It is an arithmetic number, because the mean of its divisors is an integer number (100123210).

Almost surely, 2^396851887 is an apocalyptic number.

396851887 is a deficient number, since it is larger than the sum of its proper divisors (3640953).

396851887 is a wasteful number, since it uses less digits than its factorization.

396851887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3640952.

The product of its digits is 2903040, while the sum is 55.

The square root of 396851887 is about 19921.1417092495. The cubic root of 396851887 is about 734.8682485550.

It can be divided in two parts, 3968 and 51887, that added together give a palindrome (55855).

The spelling of 396851887 in words is "three hundred ninety-six million, eight hundred fifty-one thousand, eight hundred eighty-seven".