397781401 has 4 divisors (see below), whose sum is σ = 402574032. Its totient is φ = 392988772.

The previous prime is 397781393. The next prime is 397781411. The reversal of 397781401 is 104187793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 104187793 = 167 ⋅623879.

It is a cyclic number.

It is not a de Polignac number, because 397781401 - 2³ = 397781393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397781411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2396191 + ... + 2396356.

It is an arithmetic number, because the mean of its divisors is an integer number (100643508).

Almost surely, 2^397781401 is an apocalyptic number.

It is an amenable number.

397781401 is a deficient number, since it is larger than the sum of its proper divisors (4792631).

397781401 is an equidigital number, since it uses as much as digits as its factorization.

397781401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4792630.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 397781401 is about 19944.4579018834. The cubic root of 397781401 is about 735.4415419678.

The spelling of 397781401 in words is "three hundred ninety-seven million, seven hundred eighty-one thousand, four hundred one".