1553435540 has 24 divisors (see below), whose sum is σ = 3331625472. Its totient is φ = 608153120.

The previous prime is 1553435531. The next prime is 1553435549. The reversal of 1553435540 is 455343551.

It is an interprime number because it is at equal distance from previous prime (1553435531) and next prime (1553435549).

It is a self number, because there is not a number n which added to its sum of digits gives 1553435540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553435549) 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, 825356 + ... + 827235.

It is an arithmetic number, because the mean of its divisors is an integer number (138817728).

Almost surely, 2^1553435540 is an apocalyptic number.

1553435540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1553435540 is an abundant number, since it is smaller than the sum of its proper divisors (1778189932).

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

1553435540 is a wasteful number, since it uses less digits than its factorization.

1553435540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652647 (or 1652645 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 35.

The square root of 1553435540 is about 39413.6466214432. The cubic root of 1553435540 is about 1158.1489353772.

The spelling of 1553435540 in words is "one billion, five hundred fifty-three million, four hundred thirty-five thousand, five hundred forty".