1355631640 has 32 divisors (see below), whose sum is σ = 3327460560. Its totient is φ = 492956800.

The previous prime is 1355631617. The next prime is 1355631647. The reversal of 1355631640 is 461365531.

It is a junction number, because it is equal to n+sod(n) for n = 1355631596 and 1355631605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355631647) 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, 1540051 + ... + 1540930.

Almost surely, 2^1355631640 is an apocalyptic number.

1355631640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1355631640 is an abundant number, since it is smaller than the sum of its proper divisors (1971828920).

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

1355631640 is a wasteful number, since it uses less digits than its factorization.

1355631640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3081003 (or 3080999 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 1355631640 is about 36818.9032970837. The cubic root of 1355631640 is about 1106.7441426542.

The spelling of 1355631640 in words is "one billion, three hundred fifty-five million, six hundred thirty-one thousand, six hundred forty".