1961424540 has 36 divisors (see below), whose sum is σ = 5949654984. Its totient is φ = 523046496.

The previous prime is 1961424481. The next prime is 1961424551. The reversal of 1961424540 is 454241691.

1961424540 is a `hidden beast` number, since 1 + 96 + 1 + 4 + 24 + 540 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1961424540² = 7694372452228423200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1961424495 and 1961424504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5448222 + ... + 5448581.

It is an arithmetic number, because the mean of its divisors is an integer number (165268194).

Almost surely, 2^1961424540 is an apocalyptic number.

1961424540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1961424540 is an abundant number, since it is smaller than the sum of its proper divisors (3988230444).

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

1961424540 is a wasteful number, since it uses less digits than its factorization.

1961424540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10896818 (or 10896813 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1961424540 is about 44287.9728594570. The cubic root of 1961424540 is about 1251.7680665069.

The spelling of 1961424540 in words is "one billion, nine hundred sixty-one million, four hundred twenty-four thousand, five hundred forty".