94139781 has 8 divisors (see below), whose sum is σ = 125583744. Its totient is φ = 62727840.

The previous prime is 94139723. The next prime is 94139791. The reversal of 94139781 is 18793149.

It is a happy number.

94139781 is a nontrivial binomial coefficient, being equal to C(13722, 2).

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

It is a de Polignac number, because none of the positive numbers 2^k-94139781 is a prime.

It is a super-2 number, since 2×94139781² = 17724596733455922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (94139711) 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, 1 + ... + 13721.

It is an arithmetic number, because the mean of its divisors is an integer number (15697968).

Almost surely, 2^94139781 is an apocalyptic number.

94139781 is the 13721-st triangular number and also the 6861-st hexagonal number.

It is an amenable number.

94139781 is a deficient number, since it is larger than the sum of its proper divisors (31443963).

94139781 is a wasteful number, since it uses less digits than its factorization.

94139781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16011.

The product of its digits is 54432, while the sum is 42.

The square root of 94139781 is about 9702.5656916096. The cubic root of 94139781 is about 454.9088590946.

The spelling of 94139781 in words is "ninety-four million, one hundred thirty-nine thousand, seven hundred eighty-one".