142377981 has 16 divisors (see below), whose sum is σ = 201833856. Its totient is φ = 89076416.

The previous prime is 142377979. The next prime is 142377997. The reversal of 142377981 is 189773241.

It is a cyclic number.

It is not a de Polignac number, because 142377981 - 2¹ = 142377979 is a prime.

It is a super-2 number, since 2×142377981² = 40542978947272722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142377931) 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, 15810 + ... + 23123.

It is an arithmetic number, because the mean of its divisors is an integer number (12614616).

Almost surely, 2^142377981 is an apocalyptic number.

It is an amenable number.

142377981 is a deficient number, since it is larger than the sum of its proper divisors (59455875).

142377981 is a wasteful number, since it uses less digits than its factorization.

142377981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39012.

The product of its digits is 84672, while the sum is 42.

The square root of 142377981 is about 11932.2244782773. The cubic root of 142377981 is about 522.1728373215.

The spelling of 142377981 in words is "one hundred forty-two million, three hundred seventy-seven thousand, nine hundred eighty-one".