1605396898 has 12 divisors (see below), whose sum is σ = 2801253942. Its totient is φ = 688027200.

The previous prime is 1605396889. The next prime is 1605396901. The reversal of 1605396898 is 8986935061.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1497922209 + 107474689 = 38703^2 + 10367^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8190703 + ... + 8190898.

Almost surely, 2^1605396898 is an apocalyptic number.

1605396898 is a deficient number, since it is larger than the sum of its proper divisors (1195857044).

1605396898 is a wasteful number, since it uses less digits than its factorization.

1605396898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16381617 (or 16381610 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 55.

The square root of 1605396898 is about 40067.4044330301. The cubic root of 1605396898 is about 1170.9206715895.

The spelling of 1605396898 in words is "one billion, six hundred five million, three hundred ninety-six thousand, eight hundred ninety-eight".