1605897914 has 4 divisors (see below), whose sum is σ = 2408846874. Its totient is φ = 802948956.

The previous prime is 1605897913. The next prime is 1605897919. The reversal of 1605897914 is 4197985061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4197985061 = 8563 ⋅490247.

It can be written as a sum of positive squares in only one way, i.e., 1586827225 + 19070689 = 39835^2 + 4367^2 .

It is a super-2 number, since 2×1605897914² = 5157816220379102792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1605897913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401474477 + ... + 401474480.

Almost surely, 2^1605897914 is an apocalyptic number.

1605897914 is a deficient number, since it is larger than the sum of its proper divisors (802948960).

1605897914 is an equidigital number, since it uses as much as digits as its factorization.

1605897914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802948959.

The product of its (nonzero) digits is 544320, while the sum is 50.

The square root of 1605897914 is about 40073.6561097188. The cubic root of 1605897914 is about 1171.0424668031.

The spelling of 1605897914 in words is "one billion, six hundred five million, eight hundred ninety-seven thousand, nine hundred fourteen".