39994281929 has 16 divisors (see below), whose sum is σ = 48594961152. Its totient is φ = 32171650368.

The previous prime is 39994281917. The next prime is 39994281941. The reversal of 39994281929 is 92918249993.

It is an interprime number because it is at equal distance from previous prime (39994281917) and next prime (39994281941).

It is a cyclic number.

It is not a de Polignac number, because 39994281929 - 2¹⁶ = 39994216393 is a prime.

It is a super-2 number, since 2×39994281929² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39994281979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2334974 + ... + 2352039.

It is an arithmetic number, because the mean of its divisors is an integer number (3037185072).

Almost surely, 2^39994281929 is an apocalyptic number.

It is an amenable number.

39994281929 is a deficient number, since it is larger than the sum of its proper divisors (8600679223).

39994281929 is a wasteful number, since it uses less digits than its factorization.

39994281929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4687096.

The product of its digits is 22674816, while the sum is 65.

The spelling of 39994281929 in words is "thirty-nine billion, nine hundred ninety-four million, two hundred eighty-one thousand, nine hundred twenty-nine".