1553540040 has 128 divisors (see below), whose sum is σ = 5576860800. Its totient is φ = 382406400.

The previous prime is 1553540029. The next prime is 1553540041. The reversal of 1553540040 is 400453551.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1553539986 and 1553540013.

It is not an unprimeable number, because it can be changed into a prime (1553540041) 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, 41286 + ... + 69365.

It is an arithmetic number, because the mean of its divisors is an integer number (43569225).

Almost surely, 2^1553540040 is an apocalyptic number.

1553540040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1553540040 is an abundant number, since it is smaller than the sum of its proper divisors (4023320760).

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

1553540040 is a wasteful number, since it uses less digits than its factorization.

1553540040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110684 (or 110674 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 1553540040 is about 39414.9722821163. The cubic root of 1553540040 is about 1158.1749044517.

Adding to 1553540040 its reverse (400453551), we get a palindrome (1953993591).

The spelling of 1553540040 in words is "one billion, five hundred fifty-three million, five hundred forty thousand, forty".