1965618397 has 8 divisors (see below), whose sum is σ = 1976230080. Its totient is φ = 1955019360.

The previous prime is 1965618371. The next prime is 1965618409. The reversal of 1965618397 is 7938165691.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1965618397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1965618097) 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, 610929 + ... + 614137.

It is an arithmetic number, because the mean of its divisors is an integer number (247028760).

Almost surely, 2^1965618397 is an apocalyptic number.

It is an amenable number.

1965618397 is a deficient number, since it is larger than the sum of its proper divisors (10611683).

1965618397 is a wasteful number, since it uses less digits than its factorization.

1965618397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6323.

The product of its digits is 2449440, while the sum is 55.

The square root of 1965618397 is about 44335.2951608535. The cubic root of 1965618397 is about 1252.6595952558.

The spelling of 1965618397 in words is "one billion, nine hundred sixty-five million, six hundred eighteen thousand, three hundred ninety-seven".