394427970 has 24 divisors (see below), whose sum is σ = 1025512956. Its totient is φ = 105180768.

The previous prime is 394427963. The next prime is 394427977. The reversal of 394427970 is 79724493.

It is an interprime number because it is at equal distance from previous prime (394427963) and next prime (394427977).

It can be written as a sum of positive squares in 2 ways, for example, as 366454449 + 27973521 = 19143^2 + 5289^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (394427977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2191177 + ... + 2191356.

Almost surely, 2^394427970 is an apocalyptic number.

394427970 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

394427970 is an abundant number, since it is smaller than the sum of its proper divisors (631084986).

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

394427970 is a wasteful number, since it uses less digits than its factorization.

394427970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4382546 (or 4382543 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 394427970 is about 19860.2107239576. The cubic root of 394427970 is about 733.3690338451.

The spelling of 394427970 in words is "three hundred ninety-four million, four hundred twenty-seven thousand, nine hundred seventy".