1553400340 has 12 divisors (see below), whose sum is σ = 3262140756. Its totient is φ = 621360128.

The previous prime is 1553400323. The next prime is 1553400377. The reversal of 1553400340 is 430043551.

It can be written as a sum of positive squares in 2 ways, for example, as 994267024 + 559133316 = 31532^2 + 23646^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38834989 + ... + 38835028.

It is an arithmetic number, because the mean of its divisors is an integer number (271845063).

Almost surely, 2^1553400340 is an apocalyptic number.

1553400340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1553400340 is an abundant number, since it is smaller than the sum of its proper divisors (1708740416).

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

1553400340 is a wasteful number, since it uses less digits than its factorization.

1553400340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77670026 (or 77670024 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 1553400340 is about 39413.2000730720. The cubic root of 1553400340 is about 1158.1401876372.

Adding to 1553400340 its reverse (430043551), we get a palindrome (1983443891).

The spelling of 1553400340 in words is "one billion, five hundred fifty-three million, four hundred thousand, three hundred forty".