1361267740 has 96 divisors (see below), whose sum is σ = 3369985920. Its totient is φ = 452127744.

The previous prime is 1361267729. The next prime is 1361267771. The reversal of 1361267740 is 477621631.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 1361267740.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1641646 + ... + 1642474.

It is an arithmetic number, because the mean of its divisors is an integer number (35104020).

Almost surely, 2^1361267740 is an apocalyptic number.

1361267740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1361267740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1684992960).

1361267740 is an abundant number, since it is smaller than the sum of its proper divisors (2008718180).

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

1361267740 is a wasteful number, since it uses less digits than its factorization.

1361267740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199 (or 1197 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 1361267740 is about 36895.3620391507. The cubic root of 1361267740 is about 1108.2758016129.

It can be divided in two parts, 136 and 1267740, that added together give a square (1267876 = 1126²).

The spelling of 1361267740 in words is "one billion, three hundred sixty-one million, two hundred sixty-seven thousand, seven hundred forty".