139166402 has 8 divisors (see below), whose sum is σ = 208805196. Its totient is φ = 69564672.

The previous prime is 139166387. The next prime is 139166413. The reversal of 139166402 is 204661931.

It can be written as a sum of positive squares in 2 ways, for example, as 138556441 + 609961 = 11771^2 + 781^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3818 + ... + 17114.

Almost surely, 2^139166402 is an apocalyptic number.

139166402 is a deficient number, since it is larger than the sum of its proper divisors (69638794).

139166402 is a wasteful number, since it uses less digits than its factorization.

139166402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18532.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 139166402 is about 11796.8810284753. The cubic root of 139166402 is about 518.2167739572.

The spelling of 139166402 in words is "one hundred thirty-nine million, one hundred sixty-six thousand, four hundred two".