613906 has 4 divisors (see below), whose sum is σ = 920862. Its totient is φ = 306952.

The previous prime is 613903. The next prime is 613957. The reversal of 613906 is 609316.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 403225 + 210681 = 635^2 + 459^2 .

It is not an unprimeable number, because it can be changed into a prime (613903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153475 + ... + 153478.

2⁶¹³⁹⁰⁶ is an apocalyptic number.

613906 is a deficient number, since it is larger than the sum of its proper divisors (306956).

613906 is a wasteful number, since it uses less digits than its factorization.

613906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306955.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 613906 is about 783.5215376746. The cubic root of 613906 is about 84.9898949925.

It can be divided in two parts, 6 and 13906, that multiplied together give a triangular number (83436 = T₄₀₈).

The spelling of 613906 in words is "six hundred thirteen thousand, nine hundred six".