142457640 has 128 divisors (see below), whose sum is σ = 469203840. Its totient is φ = 34384896.

The previous prime is 142457639. The next prime is 142457641. The reversal of 142457640 is 46754241.

It is an interprime number because it is at equal distance from previous prime (142457639) and next prime (142457641).

It is not an unprimeable number, because it can be changed into a prime (142457641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81819 + ... + 83541.

It is an arithmetic number, because the mean of its divisors is an integer number (3665655).

Almost surely, 2^142457640 is an apocalyptic number.

142457640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 142457640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234601920).

142457640 is an abundant number, since it is smaller than the sum of its proper divisors (326746200).

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

142457640 is a wasteful number, since it uses less digits than its factorization.

142457640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803 (or 1799 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 33.

The square root of 142457640 is about 11935.5619892823. The cubic root of 142457640 is about 522.2702025899.

The spelling of 142457640 in words is "one hundred forty-two million, four hundred fifty-seven thousand, six hundred forty".