1551423540 has 48 divisors (see below), whose sum is σ = 4347080640. Its totient is φ = 413418240.

The previous prime is 1551423509. The next prime is 1551423541. The reversal of 1551423540 is 453241551.

It is a super-2 number, since 2×1551423540² = 4813830000932263200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1551423498 and 1551423507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551423541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83416 + ... + 100304.

It is an arithmetic number, because the mean of its divisors is an integer number (90564180).

Almost surely, 2^1551423540 is an apocalyptic number.

1551423540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1551423540 is an abundant number, since it is smaller than the sum of its proper divisors (2795657100).

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

1551423540 is a wasteful number, since it uses less digits than its factorization.

1551423540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18432 (or 18430 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 1551423540 is about 39388.1141970519. The cubic root of 1551423540 is about 1157.6487102652.

The spelling of 1551423540 in words is "one billion, five hundred fifty-one million, four hundred twenty-three thousand, five hundred forty".