136407921 has 16 divisors (see below), whose sum is σ = 196124544. Its totient is φ = 83833344.

The previous prime is 136407919. The next prime is 136407923. The reversal of 136407921 is 129704631.

It is an interprime number because it is at equal distance from previous prime (136407919) and next prime (136407923).

It is not a de Polignac number, because 136407921 - 2¹ = 136407919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136407923) 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, 35905 + ... + 39521.

It is an arithmetic number, because the mean of its divisors is an integer number (12257784).

Almost surely, 2^136407921 is an apocalyptic number.

It is an amenable number.

136407921 is a deficient number, since it is larger than the sum of its proper divisors (59716623).

136407921 is a wasteful number, since it uses less digits than its factorization.

136407921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4600.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 136407921 is about 11679.3801633477. The cubic root of 136407921 is about 514.7699616733.

The spelling of 136407921 in words is "one hundred thirty-six million, four hundred seven thousand, nine hundred twenty-one".