1402637540 has 24 divisors (see below), whose sum is σ = 2958524352. Its totient is φ = 558581600.

The previous prime is 1402637507. The next prime is 1402637569. The reversal of 1402637540 is 457362041.

It is a junction number, because it is equal to n+sod(n) for n = 1402637497 and 1402637506.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149936 + ... + 159015.

It is an arithmetic number, because the mean of its divisors is an integer number (123271848).

Almost surely, 2^1402637540 is an apocalyptic number.

1402637540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1402637540 is an abundant number, since it is smaller than the sum of its proper divisors (1555886812).

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

1402637540 is a wasteful number, since it uses less digits than its factorization.

1402637540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309187 (or 309185 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 1402637540 is about 37451.8028938528. The cubic root of 1402637540 is about 1119.3910220440.

Adding to 1402637540 its reverse (457362041), we get a palindrome (1859999581).

The spelling of 1402637540 in words is "one billion, four hundred two million, six hundred thirty-seven thousand, five hundred forty".