145991407 has 8 divisors (see below), whose sum is σ = 151493760. Its totient is φ = 140584920.

The previous prime is 145991401. The next prime is 145991437. The reversal of 145991407 is 704199541.

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-145991407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145991407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145991401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20857 + ... + 26962.

It is an arithmetic number, because the mean of its divisors is an integer number (18936720).

Almost surely, 2^145991407 is an apocalyptic number.

145991407 is a deficient number, since it is larger than the sum of its proper divisors (5502353).

145991407 is an equidigital number, since it uses as much as digits as its factorization.

145991407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47933.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 145991407 is about 12082.6903874923. The cubic root of 145991407 is about 526.5534121071.

The spelling of 145991407 in words is "one hundred forty-five million, nine hundred ninety-one thousand, four hundred seven".