142897731 has 8 divisors (see below), whose sum is σ = 191385600. Its totient is φ = 94837512.

The previous prime is 142897717. The next prime is 142897747. The reversal of 142897731 is 137798241.

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

It is not a de Polignac number, because 142897731 - 2²² = 138703427 is a prime.

It is a super-2 number, since 2×142897731² = 40839523049896722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (142897031) 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, 106131 + ... + 107468.

It is an arithmetic number, because the mean of its divisors is an integer number (23923200).

Almost surely, 2^142897731 is an apocalyptic number.

142897731 is a deficient number, since it is larger than the sum of its proper divisors (48487869).

142897731 is a wasteful number, since it uses less digits than its factorization.

142897731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213825.

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

The square root of 142897731 is about 11953.9838965928. The cubic root of 142897731 is about 522.8074620277.

The spelling of 142897731 in words is "one hundred forty-two million, eight hundred ninety-seven thousand, seven hundred thirty-one".