139978411 has 4 divisors (see below), whose sum is σ = 141217272. Its totient is φ = 138739552.

The previous prime is 139978409. The next prime is 139978427. The reversal of 139978411 is 114879931.

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

It is a cyclic number.

It is not a de Polignac number, because 139978411 - 2¹ = 139978409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139978451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 619261 + ... + 619486.

It is an arithmetic number, because the mean of its divisors is an integer number (35304318).

Almost surely, 2^139978411 is an apocalyptic number.

139978411 is a deficient number, since it is larger than the sum of its proper divisors (1238861).

139978411 is a wasteful number, since it uses less digits than its factorization.

139978411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238860.

The product of its digits is 54432, while the sum is 43.

The square root of 139978411 is about 11831.2472292654. The cubic root of 139978411 is about 519.2227181570. Note that the first 3 decimals are identical.

The spelling of 139978411 in words is "one hundred thirty-nine million, nine hundred seventy-eight thousand, four hundred eleven".