136721400397 has 8 divisors (see below), whose sum is σ = 137135329344. Its totient is φ = 136307622528.

The previous prime is 136721400373. The next prime is 136721400427. The reversal of 136721400397 is 793004127631.

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

It is a cyclic number.

It is not a de Polignac number, because 136721400397 - 2³¹ = 134573916749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136721400317) 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, 1928928 + ... + 1998550.

It is an arithmetic number, because the mean of its divisors is an integer number (17141916168).

Almost surely, 2^136721400397 is an apocalyptic number.

It is an amenable number.

136721400397 is a deficient number, since it is larger than the sum of its proper divisors (413928947).

136721400397 is an equidigital number, since it uses as much as digits as its factorization.

136721400397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75539.

The product of its (nonzero) digits is 190512, while the sum is 43.

The spelling of 136721400397 in words is "one hundred thirty-six billion, seven hundred twenty-one million, four hundred thousand, three hundred ninety-seven".