394131240 has 48 divisors (see below), whose sum is σ = 1280927700. Its totient is φ = 105101568.

The previous prime is 394131239. The next prime is 394131277. The reversal of 394131240 is 42131493.

394131240 is a `hidden beast` number, since 3 + 9 + 413 + 1 + 240 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 387066276 + 7064964 = 19674^2 + 2658^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 547045 + ... + 547764.

Almost surely, 2^394131240 is an apocalyptic number.

394131240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

394131240 is an abundant number, since it is smaller than the sum of its proper divisors (886796460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

394131240 is a wasteful number, since it uses less digits than its factorization.

394131240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094826 (or 1094819 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 394131240 is about 19852.7388538710. The cubic root of 394131240 is about 733.1850820608.

The spelling of 394131240 in words is "three hundred ninety-four million, one hundred thirty-one thousand, two hundred forty".