1613993405 has 8 divisors (see below), whose sum is σ = 2003578200. Its totient is φ = 1246670656.

The previous prime is 1613993401. The next prime is 1613993443. The reversal of 1613993405 is 5043993161.

It can be written as a sum of positive squares in 4 ways, for example, as 65885689 + 1548107716 = 8117^2 + 39346^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1613993405 - 2² = 1613993401 is a prime.

It is a super-2 number, since 2×1613993405² = 5209949422766988050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613993401) 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, 5565350 + ... + 5565639.

It is an arithmetic number, because the mean of its divisors is an integer number (250447275).

Almost surely, 2^1613993405 is an apocalyptic number.

It is an amenable number.

1613993405 is a deficient number, since it is larger than the sum of its proper divisors (389584795).

1613993405 is a wasteful number, since it uses less digits than its factorization.

1613993405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11131023.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 1613993405 is about 40174.5367739318. The cubic root of 1613993405 is about 1173.0069499298.

The spelling of 1613993405 in words is "one billion, six hundred thirteen million, nine hundred ninety-three thousand, four hundred five".