142390391 has 8 divisors (see below), whose sum is σ = 167283984. Its totient is φ = 119488320.

The previous prime is 142390387. The next prime is 142390397. The reversal of 142390391 is 193093241.

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

It is a cyclic number.

It is not a de Polignac number, because 142390391 - 2² = 142390387 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 (142390397) 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, 497726 + ... + 498011.

It is an arithmetic number, because the mean of its divisors is an integer number (20910498).

Almost surely, 2^142390391 is an apocalyptic number.

142390391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

142390391 is a deficient number, since it is larger than the sum of its proper divisors (24893593).

142390391 is a wasteful number, since it uses less digits than its factorization.

142390391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995761.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 142390391 is about 11932.7444873340. The cubic root of 142390391 is about 522.1880081520.

The spelling of 142390391 in words is "one hundred forty-two million, three hundred ninety thousand, three hundred ninety-one".