2142239978 has 8 divisors (see below), whose sum is σ = 3281729472. Its totient is φ = 1048330156.

The previous prime is 2142239963. The next prime is 2142239993. The reversal of 2142239978 is 8799322412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2142239963) and next prime (2142239993).

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

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11394800 + ... + 11394987.

It is an arithmetic number, because the mean of its divisors is an integer number (410216184).

Almost surely, 2^2142239978 is an apocalyptic number.

2142239978 is a deficient number, since it is larger than the sum of its proper divisors (1139489494).

2142239978 is a wasteful number, since it uses less digits than its factorization.

2142239978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22789836.

The product of its digits is 435456, while the sum is 47.

The square root of 2142239978 is about 46284.3383662336. The cubic root of 2142239978 is about 1289.1082068220.

The spelling of 2142239978 in words is "two billion, one hundred forty-two million, two hundred thirty-nine thousand, nine hundred seventy-eight".