1606398731 has 8 divisors (see below), whose sum is σ = 1943877600. Its totient is φ = 1295918208.

The previous prime is 1606398721. The next prime is 1606398749. The reversal of 1606398731 is 1378936061.

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-1606398731 is a prime.

It is a super-2 number, since 2×1606398731² = 5161033765916820722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1606398721) 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, 6749456 + ... + 6749693.

It is an arithmetic number, because the mean of its divisors is an integer number (242984700).

Almost surely, 2^1606398731 is an apocalyptic number.

1606398731 is a deficient number, since it is larger than the sum of its proper divisors (337478869).

1606398731 is a wasteful number, since it uses less digits than its factorization.

1606398731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13499173.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 1606398731 is about 40079.9043287281. The cubic root of 1606398731 is about 1171.1641883260.

The spelling of 1606398731 in words is "one billion, six hundred six million, three hundred ninety-eight thousand, seven hundred thirty-one".