145779987 has 4 divisors (see below), whose sum is σ = 194373320. Its totient is φ = 97186656.

The previous prime is 145779983. The next prime is 145780001. The reversal of 145779987 is 789977541.

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

It is not a de Polignac number, because 145779987 - 2² = 145779983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145779983) 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, 24296662 + ... + 24296667.

It is an arithmetic number, because the mean of its divisors is an integer number (48593330).

Almost surely, 2^145779987 is an apocalyptic number.

145779987 is a deficient number, since it is larger than the sum of its proper divisors (48593333).

145779987 is an equidigital number, since it uses as much as digits as its factorization.

145779987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48593332.

The product of its digits is 4445280, while the sum is 57.

The square root of 145779987 is about 12073.9383384213. The cubic root of 145779987 is about 526.2991101439.

The spelling of 145779987 in words is "one hundred forty-five million, seven hundred seventy-nine thousand, nine hundred eighty-seven".