145639842 has 16 divisors (see below), whose sum is σ = 291492000. Its totient is φ = 48511232.

The previous prime is 145639817. The next prime is 145639849. The reversal of 145639842 is 248936541.

It is a junction number, because it is equal to n+sod(n) for n = 145639794 and 145639803.

It is not an unprimeable number, because it can be changed into a prime (145639849) 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, 898 + ... + 17090.

It is an arithmetic number, because the mean of its divisors is an integer number (18218250).

Almost surely, 2^145639842 is an apocalyptic number.

145639842 is an abundant number, since it is smaller than the sum of its proper divisors (145852158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145639842 is a wasteful number, since it uses less digits than its factorization.

145639842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17697.

The product of its digits is 207360, while the sum is 42.

The square root of 145639842 is about 12068.1333270726. The cubic root of 145639842 is about 526.1304042315.

The spelling of 145639842 in words is "one hundred forty-five million, six hundred thirty-nine thousand, eight hundred forty-two".