397742109 has 8 divisors (see below), whose sum is σ = 531549312. Its totient is φ = 264548160.

The previous prime is 397742101. The next prime is 397742159. The reversal of 397742109 is 901247793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 397742109 - 2³ = 397742101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397742101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151797 + ... + 154394.

It is an arithmetic number, because the mean of its divisors is an integer number (66443664).

Almost surely, 2^397742109 is an apocalyptic number.

It is an amenable number.

397742109 is a deficient number, since it is larger than the sum of its proper divisors (133807203).

397742109 is a wasteful number, since it uses less digits than its factorization.

397742109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306627.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 397742109 is about 19943.4728420102. The cubic root of 397742109 is about 735.4173260538.

The spelling of 397742109 in words is "three hundred ninety-seven million, seven hundred forty-two thousand, one hundred nine".