1142238640 has 20 divisors (see below), whose sum is σ = 2655705024. Its totient is φ = 456895424.

The previous prime is 1142238611. The next prime is 1142238641. The reversal of 1142238640 is 468322411.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1142238640² = 2609418221418099200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1142238641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7138912 + ... + 7139071.

Almost surely, 2^1142238640 is an apocalyptic number.

1142238640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1142238640 is an abundant number, since it is smaller than the sum of its proper divisors (1513466384).

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

1142238640 is a wasteful number, since it uses less digits than its factorization.

1142238640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14277996 (or 14277990 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 1142238640 is about 33797.0211705115. The cubic root of 1142238640 is about 1045.3272755286.

The spelling of 1142238640 in words is "one billion, one hundred forty-two million, two hundred thirty-eight thousand, six hundred forty".