851405384 has 8 divisors (see below), whose sum is σ = 1596385110. Its totient is φ = 425702688.

The previous prime is 851405369. The next prime is 851405413. The reversal of 851405384 is 483504158.

It can be written as a sum of positive squares in only one way, i.e., 493817284 + 357588100 = 22222^2 + 18910^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×851405384² = 1449782255808374912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53212829 + ... + 53212844.

Almost surely, 2^851405384 is an apocalyptic number.

It is an amenable number.

851405384 is a deficient number, since it is larger than the sum of its proper divisors (744979726).

851405384 is a wasteful number, since it uses less digits than its factorization.

851405384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106425679 (or 106425675 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 38.

The square root of 851405384 is about 29178.8516566365. The cubic root of 851405384 is about 947.7900185938.

The spelling of 851405384 in words is "eight hundred fifty-one million, four hundred five thousand, three hundred eighty-four".