136400621 has 8 divisors (see below), whose sum is σ = 155960064. Its totient is φ = 116859600.

The previous prime is 136400609. The next prime is 136400653. The reversal of 136400621 is 126004631.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136400621 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 (136400681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20156 + ... + 26058.

It is an arithmetic number, because the mean of its divisors is an integer number (19495008).

Almost surely, 2^136400621 is an apocalyptic number.

It is an amenable number.

136400621 is a deficient number, since it is larger than the sum of its proper divisors (19559443).

136400621 is an equidigital number, since it uses as much as digits as its factorization.

136400621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9211.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 136400621 is about 11679.0676425817. The cubic root of 136400621 is about 514.7607787077.

The spelling of 136400621 in words is "one hundred thirty-six million, four hundred thousand, six hundred twenty-one".