394187284 has 12 divisors (see below), whose sum is σ = 706653108. Its totient is φ = 192286400.

The previous prime is 394187267. The next prime is 394187291. The reversal of 394187284 is 482781493.

It can be written as a sum of positive squares in 2 ways, for example, as 197402500 + 196784784 = 14050^2 + 14028^2 .

It is a super-2 number, since 2×394187284² = 310767229734593312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1201627 + ... + 1201954.

It is an arithmetic number, because the mean of its divisors is an integer number (58887759).

Almost surely, 2^394187284 is an apocalyptic number.

It is an amenable number.

394187284 is a deficient number, since it is larger than the sum of its proper divisors (312465824).

394187284 is a wasteful number, since it uses less digits than its factorization.

394187284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403626 (or 2403624 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The square root of 394187284 is about 19854.1502966005. The cubic root of 394187284 is about 733.2198324799.

The spelling of 394187284 in words is "three hundred ninety-four million, one hundred eighty-seven thousand, two hundred eighty-four".