1142400440 has 32 divisors (see below), whose sum is σ = 2599290000. Its totient is φ = 451824384.

The previous prime is 1142400431. The next prime is 1142400449. The reversal of 1142400440 is 440042411.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1142400431) and next prime (1142400449).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142400449) 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, 156890 + ... + 164009.

Almost surely, 2^1142400440 is an apocalyptic number.

1142400440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1142400440 is an abundant number, since it is smaller than the sum of its proper divisors (1456889560).

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

1142400440 is a wasteful number, since it uses less digits than its factorization.

1142400440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320999 (or 320995 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1142400440 is about 33799.4147878332. The cubic root of 1142400440 is about 1045.3766306464.

Adding to 1142400440 its reverse (440042411), we get a palindrome (1582442851).

The spelling of 1142400440 in words is "one billion, one hundred forty-two million, four hundred thousand, four hundred forty".